A366682 - OEIS

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

(list; graph; refs; listen; history; text; internal format)

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