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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.

A272930 a(n) is the least k such that sigma(sigma(k)) = n*k, where sigma(n) is the sum of the divisors of n, or 0 if no such k exists.

Table of values

n	a(n)
1	1
2	2
3	8
4	15

List of values

[1, 2, 8, 15]

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

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