1,1

a(n) = A000720(A156149(n))

(PARI) p=c=0; until(0, until( isprime(c++), p=nextprime(p+1)); (p+2)%c & next; print1( primepi(c)", "))

Cf. A156155.

Sequence in context: A032324 A032072 A002030 this_sequence A156824 A053002 A053003

Adjacent sequences: A156145 A156146 A156147 this_sequence A156149 A156150 A156151

hard,more,nonn

M. F. Hasler (MHasler(AT)univ-ag.fr), Feb 04 2009