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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.

A090708 Primes whose decimal representation is a valid number in base 5 and interpreted as such is again a prime.

Table of values

n a(n)
1 2
2 3
3 23
4 43
5 131
6 241
7 313
8 401
9 1123
10 1231
11 1321
12 2111
13 2113
14 2221
15 2311
16 3323
17 4003
18 4241
19 4423
20 10103
21 10301
22 10433
23 11243
24 11423
25 12011
26 12413
27 13331
28 14323
29 14411
30 20113
31 20201
32 20443
33 21011
34 21143
35 21341
36 21433
37 22111
38 22133
39 22441
40 23431
41 24113
42 24421
43 24443
44 30211
45 31223

List of values

[2, 3, 23, 43, 131, 241, 313, 401, 1123, 1231, 1321, 2111, 2113, 2221, 2311, 3323, 4003, 4241, 4423, 10103, 10301, 10433, 11243, 11423, 12011, 12413, 13331, 14323, 14411, 20113, 20201, 20443, 21011, 21143, 21341, 21433, 22111, 22133, 22441, 23431, 24113, 24421, 24443, 30211, 31223]

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

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