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MMO 357 Moscow MO 1957 (20^n + 16^n - 3^n - 1) divisible by 323

Source:

August 20, 2019
number theorydivisible

Problem Statement

For which integer nn is N=20n+16n−3n−1N = 20^n + 16^n - 3^n - 1 divisible by 323323?
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