A366682 Number of prime factors of 11^n - 1 (counted with multiplicity).

2, 5, 4, 7, 4, 9, 4, 9, 5, 8, 4, 13, 4, 8, 7, 12, 3, 12, 3, 11, 10, 11, 5, 17, 8, 10, 6, 13, 4, 15, 5, 15, 9, 9, 8, 17, 6, 10, 12, 15, 9, 17, 4, 15, 9, 12, 5, 24, 7, 14, 9, 13, 6, 16, 10, 19, 8, 10, 5, 21, 5, 12, 16, 19, 8, 22, 6, 15, 10, 19, 7, 24, 3, 11, 15

Offset

1,1

Links

Max Alekseyev, Table of n, a(n) for n = 1..316

Formula

a(n) = bigomega(11^n-1) = A001222(A024127(n)).

Mathematica

PrimeOmega[11^Range[70]-1]

Prog

(PARI) a(n)=bigomega(11^n-1)

Crossrefs

Cf. A024127, A001222, A366681, A366683, A366684, A366685, A366687.

Cf. A046051, A057958, A057957, A057956, A057955, A057954, A057953, A057952, A057951, A366708.

Sequence in context: A021801 A102513 A100116 * A107921 A171760 A085801

Adjacent sequences: A366679 A366680 A366681 * A366683 A366684 A366685

Keyword

nonn

Author

Sean A. Irvine, Oct 16 2023

Status

approved