cp's OEIS Frontend

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.

A136948 Numbers k such that k and k^2 use only the digits 0, 4, 5, 6 and 7.

Table of values

n a(n)
1 0
2 74
3 76
4 740
5 760
6 7400
7 7600
8 74000
9 74476
10 76000
11 77766
12 667574
13 740000
14 744760
15 757666
16 760000
17 777660
18 777666
19 6675740
20 7075076
21 7400000
22 7447600
23 7576660
24 7600000
25 7776600
26 7776660
27 66757400
28 67577766
29 67607474
30 70750760
31 74000000
32 74474476
33 74476000
34 74476574
35 75765474
36 75766600
37 76000000
38 77750074
39 77766000
40 77766600
41 667574000

List of values

[0, 74, 76, 740, 760, 7400, 7600, 74000, 74476, 76000, 77766, 667574, 740000, 744760, 757666, 760000, 777660, 777666, 6675740, 7075076, 7400000, 7447600, 7576660, 7600000, 7776600, 7776660, 66757400, 67577766, 67607474, 70750760, 74000000, 74474476, 74476000, 74476574, 75765474, 75766600, 76000000, 77750074, 77766000, 77766600, 667574000]

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

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