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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.

A095723 0+1+Prime power perfect numbers: if n=Product p_i^r_i then 01PPsigma(n)= Product {Sum p_i^r_i, 0<=s_i<=r_i, s_i is 0 or one or prime} 01PPsigma(n)=2*n.

Table of values

n a(n)
1 6
2 28
3 4512
4 65520
5 694400

List of values

[6, 28, 4512, 65520, 694400]

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

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