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.

A247837 Primes p of the form sigma(2k-1) for a number k.

Table of values

n a(n)
1 13
2 31
3 307
4 1093
5 1723
6 2801
7 3541
8 5113
9 8011
10 10303
11 17293
12 19531
13 28057
14 30103
15 30941
16 86143
17 88741
18 147073
19 292561
20 459007
21 492103
22 552793
23 579883
24 598303
25 684757
26 704761
27 732541
28 735307
29 797161
30 830833
31 1191373
32 1204507
33 1353733
34 1395943
35 1424443
36 1482307

List of values

[13, 31, 307, 1093, 1723, 2801, 3541, 5113, 8011, 10303, 17293, 19531, 28057, 30103, 30941, 86143, 88741, 147073, 292561, 459007, 492103, 552793, 579883, 598303, 684757, 704761, 732541, 735307, 797161, 830833, 1191373, 1204507, 1353733, 1395943, 1424443, 1482307]