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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.

A173336 Numbers k such that tau(phi(k)) = sigma(sopf(k)).

Table of values

n a(n)
1 8
2 9
3 25
4 36
5 49
6 54
7 96
8 100
9 320
10 441
11 495
12 704
13 891
14 1029
15 1080
16 1089
17 1260
18 1331
19 1386
20 1400
21 1617
22 1701
23 1750
24 1815
25 1848
26 1950
27 1960
28 2079
29 2541
30 2574
31 2704
32 2850
33 2880
34 3000
35 3360
36 3430
37 3510
38 3861
39 4125
40 4275
41 4680
42 4704
43 4719
44 4800
45 5070
46 5096

List of values

[8, 9, 25, 36, 49, 54, 96, 100, 320, 441, 495, 704, 891, 1029, 1080, 1089, 1260, 1331, 1386, 1400, 1617, 1701, 1750, 1815, 1848, 1950, 1960, 2079, 2541, 2574, 2704, 2850, 2880, 3000, 3360, 3430, 3510, 3861, 4125, 4275, 4680, 4704, 4719, 4800, 5070, 5096]

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

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