A366627 Number of distinct prime divisors of 6^n + 1.

1, 1, 1, 2, 1, 3, 3, 3, 2, 3, 3, 2, 2, 4, 3, 5, 3, 3, 6, 3, 3, 5, 4, 3, 4, 4, 4, 5, 5, 4, 9, 2, 3, 6, 3, 10, 5, 4, 3, 9, 5, 4, 7, 2, 3, 7, 5, 2, 7, 5, 6, 8, 4, 5, 10, 7, 6, 7, 3, 2, 6, 3, 2, 9, 3, 8, 11, 5, 5, 6, 7, 4, 5, 6, 4, 10, 5, 5, 10, 6, 6, 8, 4, 5, 8

Offset

0,4

Links

Max Alekseyev, Table of n, a(n) for n = 0..420

Formula

a(n) = omega(6^n+1) = A001221(A062394(n)).

Mathematica

PrimeNu[6^Range[0, 84] + 1] (* Paul F. Marrero Romero, Nov 11 2023 *)

Prog

(PARI) for(n = 0, 100, print1(omega(6^n + 1), ", "))

Crossrefs

Cf. A062394, A001221, A057938, A366620, A366628, A366629, A366630.

Cf. A046799, A366580, A366605, A366615, A366636, A366655, A366664, A119704, A366686, A366712.

Sequence in context: A138022 A113278 A132382 * A325495 A048865 A058754

Adjacent sequences: A366624 A366625 A366626 * A366628 A366629 A366630

Keyword

nonn

Author

Sean A. Irvine, Oct 14 2023

Status

approved