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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A086838 Indices k where A057176(k) = 4.

Original entry on oeis.org

3, 6, 9, 13, 35, 66, 115, 145, 297, 402, 491, 521, 1217, 2166, 3397, 3591, 4641, 4829, 6810, 6829, 7978, 8705, 17676, 21165, 50722, 52884, 84763, 121344, 121482, 162070, 358839, 560596, 1463827, 1593475, 1668394, 2086707, 2164032, 2517791, 4364421, 4970661, 19572673, 20471839, 31904004, 31960445, 51887007
Offset: 1

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Author

Farideh Firoozbakht, Aug 08 2003

Keywords

Comments

By definition of the sequence A087045(n)+2 and A086809(n)+1 for every n > 0 are in the sequence. There are no further terms up to 200000
No more terms < 3870000. - David Wasserman, Mar 31 2005

Crossrefs

Cf. A057176, A087045, A086809.

Programs

  • Mathematica
    a[m_] := Sum[a[j], {j, 0, Mod[a[m-1], m]}]; vv={}; Do[ a[n]=If[n==0, 1, b]; v=a[n+1]; b=v; If[v==4, vv=Insert[vv, n+1, -1]; Print[vv]], {n, 0, 200000-1}]

Extensions

More terms from David Wasserman, Mar 31 2005
a(39)-a(45) from Michael S. Branicky, Mar 23 2024
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