A366717 Smallest prime dividing 12^n - 1.

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.

Links

Table of n, a(n) for n=1..71.

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

Cf. A024140, A366718, A366719.

Sequence in context: A087380 A152986 A252838 * A212541 A087994 A100755

Adjacent sequences: A366714 A366715 A366716 * A366718 A366719 A366720

Keyword

nonn

Author

Sean A. Irvine, Oct 17 2023

Status

approved