0,1

Contains primes of form 5k+1 and some composite of form 5k+1 such that (5k+1)/3 is prime.

Table of n, a(n) for n=0..51.

Sequence in context: A173972 A167488 A298566 * A038351 A068871 A004615

Adjacent sequences: A090753 A090754 A090755 * A090757 A090758 A090759

nonn

Benoit Cloitre, Feb 07 2004

approved