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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.

A072431 Numbers n for which there are exactly seven k such that n = k + reverse(k).

Table of values

n a(n)
1 77
2 132
3 707
4 727
5 747
6 767
7 787
8 807
9 827
10 847
11 867
12 887
13 1212
14 1232
15 1252
16 1272
17 1292
18 1312
19 1332
20 1352
21 1372
22 1392
23 1661
24 2321
25 7007
26 8987
27 12012
28 13992
29 16061
30 16261
31 16461
32 16661
33 16861
34 17061
35 17261
36 17461
37 17661
38 17861
39 18678
40 19338

List of values

[77, 132, 707, 727, 747, 767, 787, 807, 827, 847, 867, 887, 1212, 1232, 1252, 1272, 1292, 1312, 1332, 1352, 1372, 1392, 1661, 2321, 7007, 8987, 12012, 13992, 16061, 16261, 16461, 16661, 16861, 17061, 17261, 17461, 17661, 17861, 18678, 19338]

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

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