A077418 Number of divisors of Fibonacci(n+2)-1.

1, 2, 3, 2, 6, 6, 4, 8, 8, 4, 8, 8, 8, 8, 24, 12, 24, 12, 8, 32, 30, 4, 30, 40, 8, 16, 48, 8, 96, 24, 16, 80, 32, 8, 32, 64, 32, 16, 192, 96, 48, 24, 16, 32, 288, 24, 576, 192, 32, 128, 48, 24, 192, 24, 64, 256, 256, 16, 128, 256, 32, 16, 192, 96, 48, 96, 64, 64, 2560, 128, 320

Offset

1,2

Links

Amiram Eldar, Table of n, a(n) for n = 1..2802

Formula

a(n) = A000005(A000071(n+2)). - Amiram Eldar, Jun 24 2023

Mathematica

a[n_] := DivisorSigma[0, Fibonacci[n+2]-1]
DivisorSigma[0, Fibonacci[Range[3, 80]]-1] (* Harvey P. Dale, Nov 29 2018 *)

Prog

(PARI) a(n) = numdiv(fibonacci(n+2)-1); \\ Michel Marcus, Jun 24 2023

Crossrefs

Cf. A000005, A000071.

Sequence in context: A323507 A144176 A307686 * A005421 A348083 A306156

Adjacent sequences: A077415 A077416 A077417 * A077419 A077420 A077421

Keyword

nonn

Author

Joseph L. Pe, Dec 15 2002

Status

approved