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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A344376 Numbers that are both octagonal numbers (A000567) and octagonal pyramidal numbers (A002414).

Original entry on oeis.org

0, 1, 1045, 5985, 123395663059845, 774611255177760
Offset: 1

Views

Author

Seiichi Manyama, May 16 2021

Keywords

Comments

Terms correspond to integral points on an elliptic curve, which allows all of them to be found efficiently. - Max Alekseyev, Feb 19 2024

Crossrefs

Intersection of A000567 and A002414.
Cf. A027568, A334012.
Cf. A378361 (octagonal indices), A378918 (octagonal pyramidal indices).

Programs

  • PARI
    for(k=0, 1e5, if(ispolygonal(m=k*(k+1)*(2*k-1)/2, 8), print1(m", ")))

Extensions

Keywords 'fini' and 'full' added by Max Alekseyev, Feb 19 2024
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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