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.

A159939 Odd solutions of phi(sigma(k)) = sigma(phi(k)).

Table of values

n a(n)
1 1
2 9
3 225
4 729
5 18225
6 65025
7 140625
8 531441
9 5267025
10 11390625
11 13286025
12 18792225
13 40640625
14 87890625
15 1522170225
16 2197265625
17 3291890625
18 3839661225
19 5430953025
20 7119140625
21 8303765625
22 11745140625
23 25400390625

List of values

[1, 9, 225, 729, 18225, 65025, 140625, 531441, 5267025, 11390625, 13286025, 18792225, 40640625, 87890625, 1522170225, 2197265625, 3291890625, 3839661225, 5430953025, 7119140625, 8303765625, 11745140625, 25400390625]

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

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