E-mail: info@ahmath.com

AhMath Real than i, rational than π

Arf League

hide this To submit your answers you need to log in.
If you were not a member of this page and if your name is not listed in the score tables, you need to sign up first. Otherwise, please read the following instructions given below!

hide this This is the place where you can find the most valuable Mathematical Olympiads books!

A new problem will be released soon.

☆★☆★☆★  Newest Problem!  ★☆★☆★☆

119. Problem: 8D35 , proposed by Ahmet Arduc
119 is the smallest number n where either n or n+1 is divisible by the numbers from 1 to 8. Challenging Math Problem: 8D35
Promote Your Business, Advertise Here
Promote Your Business, Advertise Here
Promote Your Business, Advertise Here
Promote Your Business, Advertise Here
Promote Your Business, Advertise Here
Promote Your Business, Advertise Here

Format of the items of the selection menu: Problem Order, Problem Code (Difficulty Level). Red problems have a difficulty level of less than 0.75, thus, as an example, a 0.18 means only 18% of all answers submitted are correct.

Number of Responses: 4333
Number of Correct R.: 2888
Difficulty Level: 66.65
1. Problem: 595A , proposed by Ahmet Arduc, Tip: Key Fact(s): 7695
1 is the multiplicative identity.
Challenging Math Problem: 595A
Correct answers have been submitted by:
1. Mohamed Karamany
2. Jeffrey Robles
3. Joseph Rodelas
4. Mahmut Cemrek
5. Suleyman Akarsu
6. Yavuz Selim Koseoglu
7. John Gamal Aziz Attia
8. Serkan Callioglu
9. Βαρελάς Γεώρ𝛾ιος
10. Marvin Cato
11. Isaiah James de Dios Maling
12. Joselito Torculas
13. John Albert A. Reyes
14. Nheil Ignacio
15. Gerald M. Pascua
16. Angelu G. Leynes
17. Roenz Joshlee Timbol
18. Rindell Mabunga
19. Caed Mark Medul Mendoza
20. Russel J. Galanido
21. Melga Sonio
22. Mark Elis Espiridion
23. Adrian Pilotos Burgos
24. Sumet Ketsri
25. Daniel James Molina
26. Nixon Balandra
27. Jacob Sabido
28. Poetri Sonya Tarabunga
29. John Patrick
30. Lilanie Monique Torilla
31. Chris Norman Algo
32. Christian Daang
33. Grant Lewis Bulaong
34. Richard Phillip Dimaala Fernandez
35. Jake Gacuan
36. Ibrahim Demir
37. Christian Paul Patawaran
38. Amirul Faiz Abdul Muthalib
39. Norwyn Nicholson Kah
40. Jhepoy Dizon
41. Ralph Macarasig
42. Dan Lang
43. Chayapol
44. Dreimuru Tempest
45. Kurara Chibana
46. Lim Jing Ren
47. Alea Astrea
48. Kumar Ayush
49. Joem Canciller
50. Gluttony
51. Serdal Aslantas
52. Radu Bogo
53. Barry Villanueva
54. Randy Orton
55. Captain Magneto
56. Willie Revillame Wowowin
57. Mertkan Simsek
58. Mark Lawrence P Velasco
59. Srinivas Kanigiri
60. Prince Ivan Paraiso
61. Dale Angelo Azas Cortez
62. Mythreya Lakshman
63. Bikram Chohan
64. Law Tik Shun
65. Gideon Tomas
66. Jereco Dela Pena
67. John Aries Sarza
68. John Kenneth Vito Cruz
69. echo gabata
70. Anjelo V. Racho
71. Darwin Ojera
72. Andrei Alido
73. Sam Kashkooli
74. Mark Kenneth Dairo
75. Adisa Tolani
76. Hanelet Santos
77. Reygan Dionisio
78. Angelo Velasquez
79. Marvin Cato
80. Jade N. Mijares
81. Kot Behemot
82. Lee csek
83. Charles Dwight M. Pelaez
84. Fujiwara Toneri
85. Arcy Leann

Futured Math Enthusiasts

The first problem
is solved firstly by
Mohamed Karamany
Last solved problem
by Arcy Leann
Coming Soon
Long Jumper
Coming Soon
Marathon Runner
Number of page views

Score Table - Math Enthusiasts (only the first 100)

Score depends on number of correct answers and number of trials.

  • FS stands for First Solver. For each problem, there is a first solver. Each time you solve a problem as the first person your FS score increases by one.
  • SF stands for Solution Files. Some of the Math Enthusiasts sends solutions to the problems. This is to promote their valuable contribution to the Arf League.
  • SP stands for Sniper. You can get this badge if and only if you do not miss any problem in your first try and solve them correctly. Only snipers have the potential to get the full score.
  • UT stands for User Type. "MT" is for Math Teacher and "S" is for Student.

hide this Please submit your country to be listed in this table!

Order Score # of Correct Answers Names Badges Country
116Caed Mark Medul Mendoza14111MT PhilippinesPhilippines
101Lee csek01 ChinaChina
91Isaiah James de Dios Maling427MT PhilippinesPhilippines
92Jeffrey Robles165 PhilippinesPhilippines
109Angelo Velasquez162S PhilippinesPhilippines
92Richard Phillip Dimaala Fernandez690MT PhilippinesPhilippines
67Lilanie Monique Torilla055S PhilippinesPhilippines
84Jereco Dela Pena00MT PhilippinesPhilippines
92Reygan Dionisio42MT PhilippinesPhilippines
68Amirul Faiz Abdul Muthalib110MT MalaysiaMalaysia
61Sumet Ketsri563 ThailandThailand
62Kurara Chibana40S JapanJapan
54Willie Revillame Wowowin00 PhilippinesPhilippines
63Russel J. Galanido130S South KoreaSouth Korea
66Mertkan Simsek80MT TurkeyTurkey
54Marvin Cato130MT PhilippinesPhilippines
49Radu Bogo040 RomaniaRomania
52Law Tik Shun00MT Hong KongHong Kong
48Nixon Balandra346MT PhilippinesPhilippines
54Randy Orton60 United States of AmericaUnited States of America
60Rindell Mabunga131S PhilippinesPhilippines
49Arcy Leann010S PhilippinesPhilippines
35Arjun Singh Rajawat04S IndiaIndia
41Jacob Sabido05S PhilippinesPhilippines
41Darwin Ojera022MT PhilippinesPhilippines
43Fujiwara Toneri03S JapanJapan
41Joselito Torculas426 PhilippinesPhilippines
57Roenz Joshlee Timbol01S PhilippinesPhilippines
36Lim Jing Ren00S MalaysiaMalaysia
26Alea Astrea00S PhilippinesPhilippines
26Kuba Helsztynski00MT PolandPoland
19Lenard Guillermo02S PhilippinesPhilippines
20Gluttony00 PhilippinesPhilippines
29Joseph Rodelas10S PhilippinesPhilippines
20Mark Alvero00MT PhilippinesPhilippines
26Norwyn Nicholson Kah038S PhilippinesPhilippines
25Jhepoy Dizon00S PhilippinesPhilippines
32Daniel James Molina01S PhilippinesPhilippines
20Ralph Macarasig00S PhilippinesPhilippines
26Joem Canciller10 PhilippinesPhilippines
14John Albert A. Reyes06S PhilippinesPhilippines
17Nheil Ignacio08S PhilippinesPhilippines
22Hanelet Santos015S PhilippinesPhilippines
23Kumar Ayush01S IndiaIndia
28Mark Kenneth Dairo126S PhilippinesPhilippines
17Ibrahim Demir01MT TurkeyTurkey
18Francis Gerard Magtibay00S PhilippinesPhilippines
11Melga Sonio00S PhilippinesPhilippines
21Christian Daang125S PhilippinesPhilippines
14Angelu G. Leynes10S PhilippinesPhilippines
11Mark Elis Espiridion00 PhilippinesPhilippines
13Chris Norman Algo010S PhilippinesPhilippines
12Charles Dwight M. Pelaez18S PhilippinesPhilippines
7Adrian Pilotos Burgos00 PhilippinesPhilippines
16CK Alexis Balidoy01S PhilippinesPhilippines
6Yavuz Selim Koseoglu20S TurkeyTurkey
6Mahmut Cemrek00 TurkeyTurkey
6John Gamal Aziz Attia21S EgyptEgypt
6Jade N. Mijares00S PhilippinesPhilippines
6Kevin Durant10S TurkeyTurkey
6John Lester Tan00S PhilippinesPhilippines
4Βαρελάς Γεώρ𝛾ιος00 GreeceGreece
5Kot Behemot00MT United States of AmericaUnited States of America
3Gerald M. Pascua00 PhilippinesPhilippines
5Leandro Dar Juan10S PhilippinesPhilippines
2James Harden00S PhilippinesPhilippines
3John Kenneth Vito Cruz00S PhilippinesPhilippines
3wow magic00S PhilippinesPhilippines
1Suleyman Akarsu00 TurkeyTurkey
1Serkan Callioglu00 TurkeyTurkey
1Ryan Magdayo Caduyac00S PhilippinesPhilippines
1Rafael Zamora00S PhilippinesPhilippines
1Mohamed Karamany10 EgyptEgypt
1Evan Phillip Mendoza00S PhilippinesPhilippines
1Miguel00S PhilippinesPhilippines
1Adnan Donmez 00MT TurkeyTurkey
1Jay Cyril Mijares00 PhilippinesPhilippines

hide this All problems are solved 2461 times.

Score Table - Countries

Country # of Correct Answers # of Trials Performance
Hong KongHong Kong536877.94%
South KoreaSouth Korea637485.14%
United States of AmericaUnited States of America7110468.27%

Online Problem Solver

Key Facts

  • 1. Key Fact 7446 |Tags: product,rational,number,irrational
  • 2. Key Fact 7695 |Tags: fraction,lowest term,numerator,denominator,relatively prime
  • 3. Key Fact ABAD |Tags: square,even,integer,divisibility
  • 4. Key Fact BAB3 |Tags: square,odd,integer,divisibility
  • 5. Key Fact 988C |Tags: product,perfect square,consecutive numbers
  • 6. Key Fact 9A34 |Tags: divisibility
  • 7. Key Fact B664 |Tags: identity,factorial
  • 8. Key Fact 969B |Tags: identity
  • 9. Key Fact CE81 |Tags: identity
  • 10. Key Fact B945 |Tags: identity
  • 11. Key Fact BCC8 |Tags: factorial,inequality
  • 12. Key Fact 965A |Tags: identity
  • 13. Key Fact E856 |Tags: identity
  • 14. Key Fact 7C45 |Tags: Sophie-Germain,identity
  • 15. Key Fact EA1C |Tags: identity
  • 16. Key Fact 3E17 |Tags: identity,factorization
  • 17. Key Fact 2545 |Tags: identity,factorization
  • 18. Key Fact A376 |Tags: identity
  • 19. Key Fact 3278 |Tags: composite number
  • 20. Key Fact 2DCC |Tags: prime number,definition
  • 21. Key Fact 87D4 |Tags: prime number,composite number,1
  • 22. Key Fact 9E11 |Tags: prime number,composite number,1
  • 23. Key Fact A478 |Tags: prime number,even
  • 24. Key Fact 2AB2 |Tags: prime number
  • 25. Key Fact DAEA |Tags: prime numbers
  • 26. Key Fact 9ECE |Tags: prime factorization
  • 27. Key Fact 525C |Tags: prime number,composite number
  • 28. Key Fact 163E |Tags: Wilson's Theorem
  • 29. Key Fact 5221 |Tags: Bertrand's Postulate,prime number
  • 30. Key Fact 24D6 |Tags: Bonse's Inequality,prime numbers
  • 31. Key Fact C181 |Tags: prime,divisor
  • 32. Key Fact 8A33 |Tags: divisibility,square,odd,integer
  • 33. Key Fact 7B55 |Tags: divisibility
  • 34. Key Fact 8C41 |Tags: divisibility
  • 35. Key Fact 8632 |Tags: product,consecutive,integer,divisibility
  • 36. Key Fact EADA |Tags: divisibility
  • 37. Key Fact A4A7 |Tags: binomial expansion
  • 38. Key Fact 3845 |Tags: binomial expansion,number of terms
  • 39. Key Fact D8CD |Tags: identity
  • 40. Key Fact DEA5 |Tags: identity
  • 41. Key Fact 7B38 |Tags: identity
  • 42. Key Fact 2EBB |Tags: identity
  • 43. Key Fact 89DD |Tags: identity
  • 44. Key Fact ECD9 |Tags: chessboard,square
  • 45. Key Fact A86B |Tags: arithmetic mean,real numbers
  • 46. Key Fact B65C |Tags: geometric mean,real numbers
  • 47. Key Fact D477 |Tags: arithmetic mean,geometric mean,inequality
  • 48. Key Fact DDC5 |Tags: harmonic mean,real numbers
  • 49. Key Fact 29D9 |Tags: arithmetic mean,harmonic mean,inequality
  • 50. Key Fact 5375 |Tags: inequality
  • 51. Key Fact 1E7C |Tags: inequality
  • 52. Key Fact 3981 |Tags: inequality
  • 53. Key Fact 1EB9 |Tags: inequality,identity
  • 54. Key Fact D7B8 |Tags: inequality
  • 55. Key Fact 2483 |Tags: inequality
  • 56. Key Fact 6C13 |Tags: inequality
  • 57. Key Fact 7185 |Tags: inequality
  • 58. Key Fact 8C62 |Tags: inequality
  • 59. Key Fact 913D |Tags: inequality,identity
  • 60. Key Fact ADBA |Tags: Cauchy–Schwarz,inequality
  • 61. Key Fact 2169 |Tags: Chebyshev,inequality
  • 62. Key Fact E1B9 |Tags: line,intersection,parabola,abscissa,vertex,midpoint,line segment
  • 63. Key Fact 72A4 |Tags: De Moivre,formula
  • 64. Key Fact 5DB3 |Tags: fibonacci,numbers
  • 65. Key Fact 47EB |Tags: finite serie,finite sequence
  • 66. Key Fact 13D3 |Tags: infinite serie,infinite sequence
  • 67. Key Fact EAA4 |Tags: partial sum,series
  • 68. Key Fact 3332 |Tags: sequence,partial sum,series,limit
  • 69. Key Fact 2B69 |Tags: sequence,partial sum,series,limit
  • 70. Key Fact C62B |Tags: series,sum
  • 71. Key Fact 1529 |Tags: sum,infinite serie
  • 72. Key Fact E6E7 |Tags: relative error,measurement
  • 73. Key Fact 8B56 |Tags: angle,bisector,triangle
  • 74. Key Fact B4C3 |Tags: sum,exterior angles,convex,polygon
  • 75. Key Fact C4CC |Tags: triangle,circle,greatest area,isosceles triangle
  • 76. Key Fact 8146 |Tags: circle,plane,common tangent
  • 77. Key Fact B13A |Tags: lattice points,gcd,greatest common divisor
  • 78. Key Fact 4BC8 |Tags: right triangle,median
  • 79. Key Fact 2B31 |Tags: minimal polynomial
  • 80. Key Fact C77E |Tags: british flag theorem, rectangle, geometry
  • 81. Key Fact B9E9 |Tags: pythagorean triple, triangle
  • 82. Key Fact 865E |Tags: primitive pythagorean triples, triangle

If you want to be a contractor (problem writer, key fact writer, etc.), please contact AhMath by sending an email to challenging-problems@ahmath.com.

Amirul Faiz Abdul Muthalib

Amirul Faiz Abdul Muthalib

Problem Writer

Number of problems: 10

With over 5 years of hands-on, successful teaching experience, Amirul is an enthusiastic Pre-University Mathematics Lecturer in INTEC Education College, Malaysia. Being a versatile individual who love Maths, he has earned a Master’s Degree in Mechanical Engineering in Japan. He had opportunity to teach Maths in Japanese Syllabus for scholarship sponsored students who will further their study in KOSEN (National College of Technology in Japan). He also train some of his students for the National Olympiad every year.

İhsan Yücel

İhsan Yücel

Problem Writer

Number of problems: 3

Ihsan is currently in the thesis phase of his postgraduate education, which is about mathematics teaching education. He got some notable national and international achievements in various secondary school mathematics and project competitions. Likewise, his students also got many elementary and secondary level mathematical olympics achievements. In the recent past, his students got the first and the second place in the TÜBİTAK National Secondary School Research Projects Contest. One of his students, a team member of the national math team, received a bronze medal in IMO. He’s an author of many scientific articles about mathematics in the quarterly magazine "Mathematical World". He’s the founder of Matematik Meraklısı, a website dedicated to Mathematics.

Richard Phillip Dimaala Fernandez

Richard Phillip Dimaala Fernandez

Problem Writer

Number of problems: 1

Richard is an experienced math teacher in a Chinese school in the Philippines. He is a product of Philippine Normal University (National Center for Teacher Excellence). He trains students who compete in both local and international math competitions. He is a trainer in Mathematics Trainers' Guild, Philippines (MTG Philippines) and Metrobank-MTAP-DepEd Math Challenge (MMC). He is also a lecturer in one of the review centers specialized in university entrance examinations. He is also a Suken Test Passer (Mathematics Certification Institute of Japan).

Leave a Comment!

Please use the form below to send your general comments about Arf League. All fields are required!


It's a good way to practice maths and also the site encourages you to submit your answer with an accompanying solution. Participants can not just simply guess the answer or predict what will be the answer based on the given, they need to know and understand the topic. Also this refrains participants to just simply ask the answer from other people. So the method was excellent and people will definitely learn many things about math.

- Rindell Mabunga / Philippines

I want to say my deepest gratitude in creating this website. The questions are not the typical type and not normally taught to non-mathematical major degrees. I really hope that you'll continue your mission and vision in creating this site, as this serves as a platform to enhance our mathematical skills. Hoping for the best good luck!!!

- Russel J. Galanido / South Korea

I see AhMath as the one encouraging self-paced learning or practice in solving math problems. It does not put me into any kind of pressure like requiring myself to be the first one to solve the problems correctly and giving answers with a limited time. Also, it gives me excitement for the next problems to solve as well as for the appearance of my name on the list of the people who submitted the correct solutions and answers for those math problems. Overall, it gives me confidence to be better in math.
Thank you for everything, AhMath.

- Marvin Cato / Philippines

I knew AhMath from a facebook group, "Math Enthusiasts Quiz Group", that I just joined a few weeks ago. Then I found that there are the "challenging math problems" here that refresh my Math skill.
I like many ideas on this website, the word "Math Enthusiasts" exactly describes what I'm and it makes me recall the feeling about Math when I was young, it was fun and exciting!
I like the motto "Real than i, rational than n", it's playing in my head and I'm still doubt about its meaning :-D
There is no time constraint for solving the problems so we can think about the solutions in the different ways. Sometimes the new solutions reveal the beauty of Math and that only happens when we have time to think about other solutions.
Thank you the creator and moderator of this website, especially Ahmet Arduc, who brings me back to the feeling of fun and exciting with his creative problems.

- Sumet Ketsri / Thailand

Ahmath is basically a great site. The problems are really challenging and mind boggling. I really like the way that the Math enthusiasts should show the solution as well for each problem. You need to learn on your own. This site greatly help me improve my Math skills and writing solutions as well. Thank you much Ahmath for an amazing job. More power and God bless. "Train HARD, win EASY. Train Easy, win HARD". Hoping you all the best out there. Just continue on your aim to help the students as well as the non-students to further enhance their math skills. God bless and More power AHMATH FTW!!!

- Isaiah James de Dios Maling / Philippines

I want to thank sir Ahmet Arduc for creating this wonderful site AhMath. The "Challenging Math Problems" are really challenging. Most of the problems are math problems that you can't normally encounter in school. You can solve the problems in different ways. You can find some beautiful patterns while solving these problems. The problems are addictive especially the problems created by sir Ahmet. It brings me back the way i feel when i was young, the excitement and having fun when solving math problems. I'm always excited to see my name on the list of people who solved the problem correctly! I can say that I am really a Math Enthusiast now and I improved a lot with my mathematical skills. I also like that there is no time limit in solving the problems. You can solve the problems when you are not busy or you are in the mood to solve. Thank you Ahmath, I hope you'll continue to improve this site and help us to be better. Hoping you all the best, God bless!

- Caed Mark Medul Mendoza / Philippines

Go to top of page