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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.

A227304 Numbers k such that sigma(k+1) divides sigma(k-1).

Table of values

n a(n)
1 34
2 55
3 285
4 367
5 835
6 849
7 919
8 1241
9 1505
10 2911
11 2914
12 3305
13 4149
14 4188
15 6111
16 6903
17 7170
18 7913
19 8506
20 9360
21 10251
22 10541
23 12566
24 15086
25 17273
26 17815
27 19005
28 19689
29 21411
30 21462
31 24882
32 25020
33 25501
34 26610
35 28125
36 30361
37 30593
38 30789
39 31485
40 37741
41 38211
42 38983
43 39787

List of values

[34, 55, 285, 367, 835, 849, 919, 1241, 1505, 2911, 2914, 3305, 4149, 4188, 6111, 6903, 7170, 7913, 8506, 9360, 10251, 10541, 12566, 15086, 17273, 17815, 19005, 19689, 21411, 21462, 24882, 25020, 25501, 26610, 28125, 30361, 30593, 30789, 31485, 37741, 38211, 38983, 39787]

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

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