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.

A136975 Numbers k such that k and k^2 use only the digits 1, 2, 3, 5 and 7.

Table of values

n a(n)
1 1
2 5
3 11
4 15
5 35
6 111
7 115
8 235
9 335
10 715
11 1235
12 2715
13 3335
14 3511
15 3515
16 3711
17 12335
18 27115
19 33335
20 33515
21 35711
22 37115
23 72335
24 75711
25 111235
26 123335
27 132335
28 177515
29 333335
30 333515
31 357115
32 572115
33 575515
34 577515
35 723335
36 757115
37 1233335
38 1312335
39 1323335
40 3333335
41 3333515
42 3512511
43 5227115
44 5772115
45 7233335
46 11212115
47 11277115
48 11735515

List of values

[1, 5, 11, 15, 35, 111, 115, 235, 335, 715, 1235, 2715, 3335, 3511, 3515, 3711, 12335, 27115, 33335, 33515, 35711, 37115, 72335, 75711, 111235, 123335, 132335, 177515, 333335, 333515, 357115, 572115, 575515, 577515, 723335, 757115, 1233335, 1312335, 1323335, 3333335, 3333515, 3512511, 5227115, 5772115, 7233335, 11212115, 11277115, 11735515]

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

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