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.

A228567 Primes expressible as sigma(sigma(n)) - sigma(n), in order of their occurrence.

Table of values

n a(n)
1 3
2 7
3 17
4 31
5 31
6 41
7 23
8 73
9 127
10 73
11 89
12 127
13 463
14 523
15 241
16 523
17 157
18 241
19 523
20 463
21 211
22 257
23 131
24 983
25 379
26 1153
27 311
28 1153
29 83
30 983
31 521
32 4339
33 4339
34 113
35 8893
36 4339
37 4339
38 1093
39 4339
40 769
41 2851
42 8893
43 4339
44 1429
45 1097
46 4339
47 1093
48 4339
49 8893
50 4339
51 8893

List of values

[3, 7, 17, 31, 31, 41, 23, 73, 127, 73, 89, 127, 463, 523, 241, 523, 157, 241, 523, 463, 211, 257, 131, 983, 379, 1153, 311, 1153, 83, 983, 521, 4339, 4339, 113, 8893, 4339, 4339, 1093, 4339, 769, 2851, 8893, 4339, 1429, 1097, 4339, 1093, 4339, 8893, 4339, 8893]

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

Content is available under The OEIS End-User License Agreement.