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- User:Lelili
- 2024 AIME II Problems/Problem 9
- 2007 AMC 8 Problems/Problem 23
- 1951 AHSME Problems/Problem 19
- 2007 AMC 8 Problems/Problem 20
- Minnesota MathCounts
- 2017 AMC 12A Problems/Problem 25
- 2023 AMC 12A Problems/Problem 1
- MathCounts historical results
- User:Bobwang001
- DVI exam
- 2023 AMC 10A Problems/Problem 14
- 2023 AMC 12A Problems/Problem 9
- 2016 AMC 10A Problems
- 2014 AMC 10A Problems
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- 2003 AMC 8 Problems/Problem 19
- 2017 AMC 12B Problems/Problem 13
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- 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
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- 2024 USAMO Problems/Problem 1
- 2024 IMO Problems/Problem 1