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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.

A223091 Numbers k such that sigma(k - 2) = sigma(k + 2).

Table of values

n a(n)
1 53
2 68
3 117
4 222
5 321
6 1005
7 2587
8 4026
9 4185
10 4197
11 5722
12 5828
13 5961
14 8006
15 8376
16 11661
17 12369
18 12563
19 13583
20 14340
21 15367
22 16118
23 17842
24 18720
25 20543
26 25132
27 29395
28 30172
29 32667
30 36518
31 39915
32 40662
33 42425
34 42924
35 47843
36 49764
37 50040
38 50437
39 52314
40 53220

List of values

[53, 68, 117, 222, 321, 1005, 2587, 4026, 4185, 4197, 5722, 5828, 5961, 8006, 8376, 11661, 12369, 12563, 13583, 14340, 15367, 16118, 17842, 18720, 20543, 25132, 29395, 30172, 32667, 36518, 39915, 40662, 42425, 42924, 47843, 49764, 50040, 50437, 52314, 53220]

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

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