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.

A117458 Primes and their indices such that when their respective SOD's are both prime, the SOD of the index is the nextprime of the prime SOD.

Table of values

n a(n)
1 227
2 313
3 1723
4 2003
5 2311
6 2609
7 3329
8 3701
9 4007
10 4027
11 4801
12 4931
13 5107
14 7253
15 10457
16 12143
17 12163
18 12211
19 12433
20 12547
21 13063
22 14143
23 14341
24 14831
25 15139
26 15373
27 16091
28 17027
29 17047
30 19403
31 20047
32 20261
33 21059
34 21149
35 22157
36 23053
37 23293
38 23431
39 24229
40 24623

List of values

[227, 313, 1723, 2003, 2311, 2609, 3329, 3701, 4007, 4027, 4801, 4931, 5107, 7253, 10457, 12143, 12163, 12211, 12433, 12547, 13063, 14143, 14341, 14831, 15139, 15373, 16091, 17027, 17047, 19403, 20047, 20261, 21059, 21149, 22157, 23053, 23293, 23431, 24229, 24623]

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

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