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A366708 Number of prime factors of 12^n - 1 (counted with multiplicity). 9
1, 2, 2, 4, 2, 5, 3, 6, 4, 4, 4, 8, 3, 6, 6, 9, 3, 9, 2, 8, 5, 6, 4, 12, 4, 8, 6, 10, 5, 13, 5, 11, 8, 6, 9, 14, 3, 6, 7, 14, 4, 14, 5, 12, 12, 8, 3, 18, 5, 10, 6, 13, 7, 16, 8, 13, 7, 8, 4, 19, 4, 8, 8, 13, 8, 17, 5, 10, 7, 14, 4, 21, 3, 7, 11, 11, 11, 18, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Max Alekseyev, Table of n, a(n) for n = 1..310
FORMULA
a(n) = bigomega(12^n-1) = A001222(A024140(n)).
MATHEMATICA
PrimeOmega[12^Range[70]-1]
PROG
(PARI) a(n)=bigomega(12^n-1)
CROSSREFS
Cf. A024140, A001222, A046051, A057951, A057952, A057953, A057954, A057955, A057956, A057957, A057958, A250288, A252170, A366707, A366709, A366682.
Sequence in context: A333836 A125296 A366707 * A294097 A233520 A243271
Adjacent sequences: A366705 A366706 A366707 * A366709 A366710 A366711
KEYWORD
nonn
AUTHOR
Sean A. Irvine, Oct 17 2023
STATUS
approved

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Last modified August 29 21:13 EDT 2024. Contains 375518 sequences. (Running on oeis4.)