A366687 Number of prime factors of 11^n + 1 (counted with multiplicity).

1, 3, 2, 5, 2, 4, 4, 4, 3, 7, 3, 7, 4, 6, 5, 8, 3, 6, 5, 7, 4, 7, 4, 7, 7, 6, 3, 10, 6, 6, 6, 7, 4, 13, 6, 11, 7, 5, 4, 11, 5, 6, 9, 5, 6, 13, 6, 7, 5, 8, 6, 11, 3, 7, 9, 13, 7, 12, 6, 7, 8, 6, 4, 13, 3, 10, 8, 9, 7, 14, 8, 6, 10, 8, 8, 13, 6, 12, 12, 7, 10

Offset

0,2

Links

Max Alekseyev, Table of n, a(n) for n = 0..325

Formula

a(n) = bigomega(11^n+1) = A001222(A034524(n)).

Mathematica

PrimeOmega[11^Range[70]+1]

Prog

(PARI) a(n)=bigomega(11^n+1)

Crossrefs

Cf. A034524, A001222, A057934, A062308, A366686, A366688, A366689, A366690.

Cf. A054992, A057941, A057940, A057939, A057938, A057937, A057936, A057935, A057934, A366713.

Sequence in context: A208889 A127750 A112528 * A154421 A057034 A075410

Adjacent sequences: A366684 A366685 A366686 * A366688 A366689 A366690

Keyword

nonn

Author

Sean A. Irvine, Oct 16 2023

Status

approved