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number theory 12
- CSMC 2011 B2 Mar 10, 2023
- AMC 2005 10B P24 Mar 10, 2023
- AIME 1987 P5 Mar 6, 2023
- Fermat 2009 Q23 Feb 18, 2023
- Fermat 1998 Q22 Feb 4, 2023
- Fermat 2017 Q23 Dec 30, 2022
- Fermat 2006 Q24 Dec 30, 2022
- IMO 1959 P1 Dec 13, 2022
- AIME 1999 P3 Dec 13, 2022
- AIME 1983 P6 Dec 12, 2022
- AIME 1986 P11 Dec 12, 2022
- AHSME 1960 P25 Dec 12, 2022