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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.

A174441 Primes p such that the concatenations p//1331 and 1331//p are both prime numbers (for naturals see A174355).

Table of values

n a(n)
1 53
2 347
3 431
4 641
5 647
6 821
7 1709
8 1973
9 2081
10 2591
11 2657
12 2963
13 4073
14 4139
15 4643
16 4787
17 5039
18 5483
19 5657
20 6029
21 6791
22 6917
23 6959
24 7127
25 7673
26 8273
27 8693
28 8807
29 8849
30 9221
31 9311
32 9689
33 10139
34 10457
35 11423
36 12503
37 12743
38 13619
39 13913
40 14549

List of values

[53, 347, 431, 641, 647, 821, 1709, 1973, 2081, 2591, 2657, 2963, 4073, 4139, 4643, 4787, 5039, 5483, 5657, 6029, 6791, 6917, 6959, 7127, 7673, 8273, 8693, 8807, 8849, 9221, 9311, 9689, 10139, 10457, 11423, 12503, 12743, 13619, 13913, 14549]

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

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