1,1

These exponents are congruent to {0, 1, 3} mod 6.

Table of n, a(n) for n=1..6.

Samuel S. Wagstaff, Jr. The Cunningham Project

Cf. A001562.

Sequence in context: A234310 A141338 A237366 * A216564 A145042 A153892

Adjacent sequences: A216528 A216529 A216530 * A216532 A216533 A216534

nonn

V. Raman, Sep 08 2012

approved