A366707 Number of distinct prime divisors of 12^n - 1.

1, 2, 2, 4, 2, 5, 3, 6, 4, 4, 3, 8, 3, 6, 6, 9, 3, 9, 2, 7, 5, 5, 4, 12, 4, 7, 6, 10, 5, 13, 5, 11, 7, 6, 9, 14, 3, 6, 7, 13, 4, 13, 5, 11, 12, 8, 3, 18, 5, 10, 6, 12, 7, 16, 7, 13, 7, 8, 4, 18, 4, 8, 8, 13, 8, 16, 5, 10, 7, 14, 4, 21, 3, 7, 11, 11, 10, 17, 4

Offset

1,2

Links

Max Alekseyev, Table of n, a(n) for n = 1..310

Formula

a(n) = omega(12^n-1) = A001221(A024140(n)).

Prog

(PARI) for(n = 1, 100, print1(omega(12^n - 1), ", "))

Crossrefs

Cf. A024140, A001221, A046800, A133801, A102347, A250288, A252170, A366708, A366709, A366681.

Sequence in context: A321443 A333836 A125296 * A366708 A294097 A233520

Adjacent sequences: A366704 A366705 A366706 * A366708 A366709 A366710

Keyword

nonn

Author

Sean A. Irvine, Oct 17 2023

Status

approved