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A366717
Smallest prime dividing 12^n - 1.
5
11, 11, 11, 5, 11, 7, 11, 5, 11, 11, 11, 5, 11, 11, 11, 5, 11, 7, 11, 5, 11, 11, 11, 5, 11, 11, 11, 5, 11, 7, 11, 5, 11, 11, 11, 5, 11, 11, 11, 5, 11, 7, 11, 5, 11, 11, 11, 5, 11, 11, 11, 5, 11, 7, 11, 5, 11, 11, 11, 5, 11, 11, 11, 5, 11, 7, 11, 5, 11, 11, 11
OFFSET
1,1
COMMENTS
Periodic with period 12, repeat of 11, 11, 11, 5, 11, 7, 11, 5, 11, 11, 11, 5.
FORMULA
a(n) = A020639(A024140(n)). - Paul F. Marrero Romero, Oct 25 2023
MATHEMATICA
Table[FactorInteger[12^n - 1][[1, 1]], {n, 71}] (* Paul F. Marrero Romero, Oct 25 2023 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Sean A. Irvine, Oct 17 2023
STATUS
approved