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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.

A083983 If k is a number with exactly two distinct decimal digits, say a and b, neither of which is 0 (i.e., a member of A101594), define the self-complement of k, SC(k), to be the number obtained by replacing a with b and vice versa. E.g. SC(232233) = 323322. Sequence contains primes p such that SC(p) is also a prime.

Table of values

n a(n)
1 13
2 17
3 31
4 37
5 71
6 73
7 79
8 97
9 113
10 131
11 191
12 199
13 313
14 331
15 337
16 773
17 911
18 919
19 1171
20 7717
21 11113
22 11119
23 11177
24 11717
25 33331
26 77171
27 77711
28 79999
29 97777
30 99991
31 113111
32 131111
33 131113
34 131311
35 191999
36 199999
37 313133
38 313331
39 313333
40 331333
41 333737
42 377737

List of values

[13, 17, 31, 37, 71, 73, 79, 97, 113, 131, 191, 199, 313, 331, 337, 773, 911, 919, 1171, 7717, 11113, 11119, 11177, 11717, 33331, 77171, 77711, 79999, 97777, 99991, 113111, 131111, 131113, 131311, 191999, 199999, 313133, 313331, 313333, 331333, 333737, 377737]

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

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