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.

A307959 Primitive coreful perfect numbers: powerful numbers k such that csigma(k) = 2*k, where csigma(k) is the sum of the coreful divisors of k (A057723).

Table of values

n a(n)
1 36
2 392
3 30752
4 2064512
5 549621604352
6 2251765454077952
7 144114638320566272
8 9903520305059670164485701632
9 12259964326927110856232952250923146488025299504439754752
10 237142198758023568227473376531545064850552499416058362196624559881526665860349952

List of values

[36, 392, 30752, 2064512, 549621604352, 2251765454077952, 144114638320566272, 9903520305059670164485701632, 12259964326927110856232952250923146488025299504439754752, 237142198758023568227473376531545064850552499416058362196624559881526665860349952]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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