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.

A015863 Numbers k such that sigma(k) = sigma(k+4).

Table of values

n a(n)
1 51
2 66
3 115
4 220
5 319
6 1003
7 2585
8 4024
9 4183
10 4195
11 5720
12 5826
13 5959
14 8004
15 8374
16 11659
17 12367
18 12561
19 13581
20 14338
21 15365
22 16116
23 17840
24 18718
25 20541
26 25130
27 29393
28 30170
29 32665
30 36516
31 39913
32 40660
33 42423
34 42922
35 47841
36 49762

List of values

[51, 66, 115, 220, 319, 1003, 2585, 4024, 4183, 4195, 5720, 5826, 5959, 8004, 8374, 11659, 12367, 12561, 13581, 14338, 15365, 16116, 17840, 18718, 20541, 25130, 29393, 30170, 32665, 36516, 39913, 40660, 42423, 42922, 47841, 49762]