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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.

A176597 Double primes: concatenation of the n-th prime with itself.

Table of values

n a(n)
1 22
2 33
3 55
4 77
5 1111
6 1313
7 1717
8 1919
9 2323
10 2929
11 3131
12 3737
13 4141
14 4343
15 4747
16 5353
17 5959
18 6161
19 6767
20 7171
21 7373
22 7979
23 8383
24 8989
25 9797
26 101101
27 103103
28 107107
29 109109
30 113113
31 127127
32 131131
33 137137
34 139139
35 149149
36 151151
37 157157
38 163163

List of values

[22, 33, 55, 77, 1111, 1313, 1717, 1919, 2323, 2929, 3131, 3737, 4141, 4343, 4747, 5353, 5959, 6161, 6767, 7171, 7373, 7979, 8383, 8989, 9797, 101101, 103103, 107107, 109109, 113113, 127127, 131131, 137137, 139139, 149149, 151151, 157157, 163163]

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

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