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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.

A136865 Numbers k such that k and k^2 use only the digits 0, 1, 4, 7 and 9.

Table of values

n a(n)
1 0
2 1
3 7
4 10
5 70
6 97
7 100
8 107
9 700
10 701
11 970
12 997
13 1000
14 1007
15 1049
16 1070
17 1071
18 7000
19 7001
20 7010
21 7071
22 9700
23 9701
24 9970
25 9997
26 10000
27 10007
28 10070
29 10097
30 10490
31 10700
32 10710
33 14107
34 70000
35 70001
36 70010
37 70100
38 70107
39 70499
40 70710
41 97000
42 97001
43 97010
44 99700
45 99970
46 99997
47 100000
48 100007
49 100070
50 100097
51 100499
52 100700
53 100970
54 104900
55 107000

List of values

[0, 1, 7, 10, 70, 97, 100, 107, 700, 701, 970, 997, 1000, 1007, 1049, 1070, 1071, 7000, 7001, 7010, 7071, 9700, 9701, 9970, 9997, 10000, 10007, 10070, 10097, 10490, 10700, 10710, 14107, 70000, 70001, 70010, 70100, 70107, 70499, 70710, 97000, 97001, 97010, 99700, 99970, 99997, 100000, 100007, 100070, 100097, 100499, 100700, 100970, 104900, 107000]

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

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