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.

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A217738 Numbers k such that Fibonacci(k) is divisible by k*(k+1).

Original entry on oeis.org

60, 108, 180, 240, 540, 600, 660, 768, 1008, 1200, 1320, 1620, 1800, 1860, 2160, 2520, 2688, 2736, 3000, 3060, 3300, 3360, 3528, 3888, 4200, 4800, 4860, 4968, 5280, 5520, 5580, 5880, 6120, 6480, 6600, 6720, 6840, 7320, 7560, 7680, 8100, 8208, 8640, 9000, 9180, 9240, 9600
Offset: 1

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Author

Alex Ratushnyak, Mar 22 2013

Keywords

Comments

Indices of 0's in A217737.
Conjectures: the sequence is infinite; all terms are divisible by 12.

Crossrefs

Programs

  • Mathematica
    Select[Range[10000],Divisible[Fibonacci[#],#(#+1)]&] (* Harvey P. Dale, Aug 14 2014 *)
  • Python
    prpr, prev = 0, 1
    for i in range(1, 1000):
        cur = prpr + prev
        a = prev % (i*(i+1))
        if a==0:
          print(str(i), end=', ')
        prpr, prev = prev, cur
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