1,1

All primes of the form 6k-1 are in this sequence. In addition, about half of all primes of the form 6k+1 appear to be here. See A154756 for the primes not in this sequence.

Table of n, a(n) for n=1..57.

A000073

Sequence in context: A147813 A274386 A079545 * A040095 A040028 A049589

Adjacent sequences: A154752 A154753 A154754 * A154756 A154757 A154758

nonn

T. D. Noe, Jan 15 2009

approved