A280638 Number of odd divisors of Bell(n).

1, 1, 1, 2, 4, 2, 4, 2, 12, 16, 6, 8, 8, 2, 4, 8, 4, 10, 8, 12, 12, 16, 64, 8, 8, 64, 16, 64, 16, 16, 64, 4, 8, 4, 16, 48, 16, 8, 8, 8, 8, 16, 2, 128, 16, 32, 16, 64, 16, 4, 16, 8, 24, 16, 8, 2, 576, 8, 8, 16, 8, 128, 4, 128, 16, 8, 64, 8, 8, 16, 16

Offset

0,4

Links

Amiram Eldar, Table of n, a(n) for n = 0..104

Formula

a(n) = A001227(A000110(n)).

Mathematica

Table[B=BellB[n]; r=IntegerExponent[B, 2]; DivisorSigma[0, B/2^r], {n, 0, 60}]

Crossrefs

Cf. A000110, A001227, A280589.

Sequence in context: A194577 A334970 A274708 * A333725 A163894 A307095

Adjacent sequences: A280635 A280636 A280637 * A280639 A280640 A280641

Keyword

nonn

Author

Vincenzo Librandi, Jan 07 2017

Extensions

Offset corrected by Amiram Eldar, Nov 23 2019

Status

approved