A366771 Number of divisors of A001045(n) (Jacobsthal numbers).

1, 1, 2, 2, 2, 4, 2, 4, 6, 4, 2, 16, 2, 4, 8, 8, 2, 24, 2, 24, 8, 8, 2, 64, 8, 4, 16, 32, 4, 64, 2, 16, 16, 4, 16, 384, 4, 4, 8, 96, 4, 96, 2, 64, 48, 8, 4, 512, 4, 64, 32, 64, 4, 128, 24, 128, 16, 32, 8, 3072, 2, 4, 48, 64, 32, 256, 4, 64, 16, 256, 4, 6144, 4

Offset: 1

Author

Sean A. Irvine, Oct 21 2023

Keywords

• nonn

Examples

			a(9) = 6 because Jacobsthal(9) = 171 has divisors {1, 3, 9, 19, 57, 171}.
		

Links

• Amiram Eldar, Table of n, a(n) for n = 1..1122

Crossrefs

Cf. A000005, A001045, A366769, A366770, A366772, A063375.

Formula

a(n) = sigma0(Jacobsthal(n)) = A000005(A001045(n)).