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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.

A090999 Numbers k such that sigma(k)-k = pi(sigma(k)).

Table of values

n	a(n)
1	1
2	15
3	21
4	33
5	23069
6	42029
7	148031
8	209911
9	3271099

List of values

[1, 15, 21, 33, 23069, 42029, 148031, 209911, 3271099]

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

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