cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A272122 a(n) is the number of positive divisors of A003266(n).

Original entry on oeis.org

1, 1, 2, 4, 8, 20, 40, 120, 288, 864, 1728, 4800, 9600, 28800, 84480, 304128, 608256, 2322432, 9289728, 40642560, 116121600, 348364800, 696729600, 3185049600, 8918138880, 26754416640, 149824733184, 624269721600, 1248539443200, 6522981580800, 26091926323200, 107629196083200
Offset: 1

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Author

Altug Alkan, Apr 28 2016

Keywords

Crossrefs

Programs

  • Mathematica
    a[n_] := DivisorSigma[0, Fibonorial[n]]; Array[a, 32] (* Amiram Eldar, Aug 09 2022 *)
  • PARI
    a(n) = numdiv(prod(k=1, n, fibonacci(k)));

Formula

a(n) = A000005(A003266(n)).
a(n+1) = 2*a(n) when n is in A069744.