1,1

The terms are congruent to 2 (mod 3).

Table of n, a(n) for n=1..23.

Samuel S. Wagstaff, Jr. The Cunningham Project

Cf. A216518.

Sequence in context: A162042 A162043 A016121 * A245108 A195137 A026822

Adjacent sequences: A216516 A216517 A216518 * A216520 A216521 A216522

nonn

V. Raman, Sep 08 2012

approved