Integers k such that 2^k == 7 (mod k).

A033981

Integers k such that 2^k == 7 (mod k).

Terms

    a(0) =1a(1) =5a(2) =25a(3) =1727a(4) =3830879a(5) =33554425a(6) =19584403931a(7) =25086500333

External references