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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A125708 Numbers k such that A115963(k) is prime.

Original entry on oeis.org

3, 5, 9, 43, 150, 300, 516, 1254
Offset: 1

Views

Author

Alexander Adamchuk, Feb 01 2007, Mar 01 2007

Keywords

Comments

A115963(n) is the numerator of Sum_{k=1..n} 1/prime(k)^3.
a(9) > 5000. - Michael S. Branicky, Aug 04 2024

Crossrefs

Programs

  • Mathematica
    f=0;Do[p=Prime[n];f=f+1/p^3;g=Numerator[f];If[PrimeQ[g],Print[{n,p,g}]],{n,1,50}]

Extensions

a(6) from Alexander Adamchuk, Sep 16 2010
a(7)-a(8) from Amiram Eldar, Feb 18 2019
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