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- 2023 AMC 10A Problems/Problem 14
- 2023 AMC 12A Problems/Problem 9
- 2016 AMC 10A Problems
- 2014 AMC 10A Problems
- User:Almaz82beget
- User:Cxsmi
- 2003 AMC 8 Problems/Problem 19
- DVI exam
- 2017 AMC 12B Problems/Problem 13
- User:Yiyi-jp
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- User:Thabet
- User:Bigeymily
- Answer
- 1969 IMO Problems/Problem 6
- 1969 IMO Problems/Problem 5
- 1957 AHSME Problems/Problem 50
- Carnegie Mellon Informatics and Mathematics Competition
- File:Euler phi trend 50000.png
- Euler's totient function
- Euler phi function
- 1957 AHSME Problems/Problem 49
- 1957 AHSME Problems/Problem 47
- 1957 AHSME Problems/Problem 46
- 1957 AHSME Problems/Problem 45
- Daniel Zhou's Profile
- 1957 AHSME Problems/Problem 44
- 1957 AHSME Problems/Problem 43
- 1957 AHSME Problems/Problem 41
- 1957 AHSME Problems/Problem 40
- 1998 IMO Problems/Problem 5
- 1957 AHSME Problems/Problem 39
- 1998 IMO Problems/Problem 1
- Talk:1998 IMO Problems/Problem 1
- 1996 AJHSME Problems/Problem 18
- User:Speedcuber7
- User:BUREGER-KING-SURVEY
- User:Hitclubgripe
- 2024 USAMO Problems/Problem 1
- 2024 IMO Problems/Problem 1
- 2024 IMO Problems/Problem 4
- User:Covongotngao
- User:Michaelwenquan
- User:Enderman 1010
- 2011 AMC 12A Problems/Problem 16
- Beestar Computer Science
- User:Yerrayold
- 2024 AMC 8 Problems/Problem 4
- 2023 AMC 12B Problems/Problem 19
- 1957 AHSME Problems/Problem 37