This website contains problems from math contests. Problems and corresponding tags were obtained from the Art of Problem Solving website.

Tags were heavily modified to better represent problems.

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Found problems: 3

1990 IMO Shortlist, 23
Tags: divisibility , orders and lte , modular arithmetic , number theory
Determine all integers $ n > 1$ such that \[ \frac {2^n \plus{} 1}{n^2} \] is an integer.

1990 IMO Longlists, 79
Tags: divisibility , orders and lte , number theory , modular arithmetic
Determine all integers $ n > 1$ such that \[ \frac {2^n \plus{} 1}{n^2} \] is an integer.

1990 IMO, 3
Tags: divisibility , orders and lte , number theory , modular arithmetic
Determine all integers $ n > 1$ such that \[ \frac {2^n \plus{} 1}{n^2} \] is an integer.