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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.

A137116 Numbers k such that k and k^2 use only the digits 2, 5, 7, 8 and 9.

Table of values

n a(n)
1 5
2 27
3 77
4 85
5 527
6 727
7 7227
8 9777
9 28277
10 29585
11 88277
12 99277
13 278527
14 298827
15 2788527
16 2789227
17 5289227
18 8875727
19 9889277
20 22925527
21 27797977
22 29879585
23 52898827
24 85298827
25 88875527
26 99789227
27 99988777
28 278889277
29 287279585
30 292898827
31 297875527
32 299929585
33 527252527
34 528982977
35 727528527
36 727825527
37 727925527
38 988579585
39 992587527

List of values

[5, 27, 77, 85, 527, 727, 7227, 9777, 28277, 29585, 88277, 99277, 278527, 298827, 2788527, 2789227, 5289227, 8875727, 9889277, 22925527, 27797977, 29879585, 52898827, 85298827, 88875527, 99789227, 99988777, 278889277, 287279585, 292898827, 297875527, 299929585, 527252527, 528982977, 727528527, 727825527, 727925527, 988579585, 992587527]

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

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