1,2

Conjecture. If n>4 and a(n) is a multiple of 4, then a(n)/4 is a prime. (This has been verified up to n = 2000.)

Table of n, a(n) for n=1..55.

Cf. A000224, A123722.

Sequence in context: A311663 A333572 A322958 * A279227 A261649 A298797

Adjacent sequences: A123720 A123721 A123722 * A123724 A123725 A123726

nonn

John W. Layman, Oct 12 2006

approved