A278255 Least number with the prime signature of the n-th pentagonal number.

1, 2, 12, 6, 6, 6, 30, 12, 12, 6, 48, 210, 6, 6, 210, 24, 12, 12, 60, 30, 30, 30, 30, 60, 12, 30, 1080, 30, 6, 30, 30, 240, 60, 6, 420, 60, 30, 6, 210, 420, 6, 120, 192, 30, 60, 6, 210, 840, 12, 12, 420, 210, 6, 120, 210, 60, 210, 6, 120, 210, 30, 30, 420, 96, 30, 30, 180, 210, 30, 210, 30, 1260, 6, 30, 5040, 30, 210, 30, 30, 120, 144, 60, 60, 210, 30, 6, 2310

Offset

1,2

Links

Antti Karttunen, Table of n, a(n) for n = 1..10000

Formula

a(n) = A046523(A000326(n)).

Prog

(Scheme) (define (A278255 n) (A046523 (A000326 n)))

Crossrefs

Cf. A000326, A046523.

Cf. also A278246, A278247, A278251, A278253, A278254.

Sequence in context: A112100 A079080 A228454 * A345469 A035877 A086494

Adjacent sequences: A278252 A278253 A278254 * A278256 A278257 A278258

Keyword

nonn

Author

Antti Karttunen, Nov 21 2016

Status

approved