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.

A173337 Numbers k>1 such that phi(phi(k)) = sigma(sopf(k)).

Table of values

n a(n)
1 40
2 50
3 54
4 171
5 195
6 231
7 330
8 377
9 387
10 518
11 638
12 742
13 745
14 888
15 1057
16 1141
17 1397
18 1561
19 1788
20 2422
21 2682
22 2763
23 3206
24 3357
25 3805
26 4037
27 4344
28 4382
29 4915
30 5093
31 5138
32 5391
33 5558
34 5951
35 6147
36 8063
37 8952
38 9132
39 9422
40 10109
41 10968
42 11796
43 12287
44 12481

List of values

[40, 50, 54, 171, 195, 231, 330, 377, 387, 518, 638, 742, 745, 888, 1057, 1141, 1397, 1561, 1788, 2422, 2682, 2763, 3206, 3357, 3805, 4037, 4344, 4382, 4915, 5093, 5138, 5391, 5558, 5951, 6147, 8063, 8952, 9132, 9422, 10109, 10968, 11796, 12287, 12481]