A366770 Number of prime factors of A001045(n) (Jacobsthal numbers) (counted with multiplicity).

0, 0, 1, 1, 1, 2, 1, 2, 3, 2, 1, 4, 1, 2, 3, 3, 1, 5, 1, 5, 3, 3, 1, 6, 3, 2, 5, 5, 2, 6, 1, 4, 4, 2, 4, 9, 2, 2, 3, 7, 2, 7, 1, 6, 6, 3, 2, 9, 2, 6, 5, 6, 2, 8, 5, 7, 4, 5, 3, 12, 1, 2, 6, 6, 5, 8, 2, 6, 4, 8, 2, 13, 2, 4, 6, 6, 5, 7, 1, 9, 9, 4, 5, 13, 3, 4

Offset

1,6

Links

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

Formula

a(n) = bigomega(Jacobsthal(n)) = A001222(A001045(n)).

Example

a(9) = 3 because Jacobsthal(9) = 171 = 3^2 * 19.

Crossrefs

Cf. A001045, A001222, A366769, A366771, A038575.

Sequence in context: A187801 A134388 A055095 * A355249 A337618 A048685

Adjacent sequences: A366767 A366768 A366769 * A366771 A366772 A366773

Keyword

nonn

Author

Sean A. Irvine, Oct 21 2023

Status

approved