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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.

A072611 Numbers k such that phi(k) divides sigma(k+1) - sigma(k).

Table of values

n a(n)
1 1
2 2
3 6
4 14
5 30
6 40
7 70
8 140
9 170
10 174
11 206
12 215
13 238
14 390
15 459
16 518
17 923
18 957
19 1334
20 1364
21 1540
22 1634
23 2685
24 2974
25 4364
26 5180
27 5934
28 6048
29 6467
30 6510
31 6623
32 8028
33 8094
34 8260
35 8814
36 12136
37 12954
38 14099
39 14841
40 15416
41 16472
42 17094
43 17835
44 17927
45 18873

List of values

[1, 2, 6, 14, 30, 40, 70, 140, 170, 174, 206, 215, 238, 390, 459, 518, 923, 957, 1334, 1364, 1540, 1634, 2685, 2974, 4364, 5180, 5934, 6048, 6467, 6510, 6623, 8028, 8094, 8260, 8814, 12136, 12954, 14099, 14841, 15416, 16472, 17094, 17835, 17927, 18873]

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

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