1,2

Seems to be A006093 with at least one additional term, 11 at a(6).

Antti Karttunen, Table of n, a(n) for n = 1..310

a(n) = A249151(A249424(n)).

(Scheme) (define (A249428 n) (A249151 (A249424 n)))

Cf. A006093 (seems to be a subsequence).

Cf. also A056077, A249151, A249424.

Sequence in context: A275956 A109133 A056077 * A129630 A026429 A086917

Adjacent sequences: A249425 A249426 A249427 * A249429 A249430 A249431

nonn

Antti Karttunen, Oct 28 2014

approved