1,2

Table of n, a(n) for n=1..70.

a(1)=1 because A163163(1)=1 is not prime. a(2)=4 because A163163(4)=6 is not prime.

Cf. A000005, A000203, A007503, A163163.

Sequence in context: A174240 A287342 A309177 * A120351 A137230 A283564

Adjacent sequences: A163161 A163162 A163163 * A163165 A163166 A163167

nonn,easy

Juri-Stepan Gerasimov, Jul 22 2009

33 removed by R. J. Mathar, Jul 25 2009

approved