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A366682
Number of prime factors of 11^n - 1 (counted with multiplicity).
7
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
FORMULA
a(n) = bigomega(11^n-1) = A001222(A024127(n)).
MATHEMATICA
PrimeOmega[11^Range[70]-1]
PROG
(PARI) a(n)=bigomega(11^n-1)
KEYWORD
nonn
AUTHOR
Sean A. Irvine, Oct 16 2023
STATUS
approved