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.

A247111 Integers k such that sigma(sigma(k) - k) = 2*k, where sigma is the sum of divisors, A000203.

Table of values

n a(n)
1 6
2 28
3 36
4 496
5 8128
6 33550336
7 8589869056

List of values

[6, 28, 36, 496, 8128, 33550336, 8589869056]

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

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