0,1

R. K. Guy, Unsolved Problems in Number Theory, E16.

Table of n, a(n) for n=0..74.

Sequence in context: A144518 A051542 A083660 * A205128 A292249 A205134

Adjacent sequences: A003076 A003077 A003078 * A003080 A003081 A003082

nonn,easy

N. J. A. Sloane.

approved