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

Author

Vincenzo Librandi, Jan 07 2017

Keywords

• nonn

Links

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

Crossrefs

Cf. A000110, A001227, A280589.

Programs

Mathematica

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

Formula

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

Extensions

Offset corrected by Amiram Eldar, Nov 23 2019