MathDB

2

Part of 2022 China Second Round

Problems(1)

China Second Round Olympiad 2022 Test 2 P2

Source: China Second Round Olympiad 2022 Test 2

9/11/2022
Integer nn has kk different prime factors. Prove that σ(n)∣(2n−k)!\sigma (n) \mid (2n-k)!
number theory