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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.

A291638 Numbers n such that psi(n) and sigma(n) both are perfect squares and n is not a squarefree number.

Table of values

n a(n)
1 370440
2 1704024
3 3926664
4 11039112
5 13854456
6 21707784
7 25264008
8 28375704
9 40822488
10 44378712
11 57862728
12 59196312
13 63937944
14 75051144
15 79051896
16 79940952
17 103500936
18 107946216
19 128394504
20 134766072
21 162178632
22 169735608
23 177737112
24 191517480
25 193530168
26 195221880
27 196407288
28 215077464

List of values

[370440, 1704024, 3926664, 11039112, 13854456, 21707784, 25264008, 28375704, 40822488, 44378712, 57862728, 59196312, 63937944, 75051144, 79051896, 79940952, 103500936, 107946216, 128394504, 134766072, 162178632, 169735608, 177737112, 191517480, 193530168, 195221880, 196407288, 215077464]

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

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