1,1

The first 0 is for n=52. Are there others?

Table of n, a(n) for n=1..72.

2+2*3-1=7 so a(1)=2

2*3+2*3*5-1=35 is composite but 2*3+2*3*5+1=37 is prime so a(2)=3

Sequence in context: A071191 A300903 A097428 * A265570 A265554 A082463

Adjacent sequences: A126069 A126070 A126071 * A126073 A126074 A126075

nonn

Pierre CAMI, Mar 01 2007

approved