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.

A136831 Numbers k such that k and k^2 use only the digits 0, 1, 2 and 7.

Table of values

n a(n)
1 0
2 1
3 10
4 11
5 100
6 101
7 110
8 1000
9 1001
10 1010
11 1011
12 1100
13 1101
14 10000
15 10001
16 10010
17 10011
18 10100
19 10110
20 11000
21 11001
22 11010
23 100000
24 100001
25 100010
26 100011
27 100100
28 100101
29 100110
30 101000
31 101001
32 101100
33 110000
34 110001
35 110010
36 110100
37 1000000
38 1000001
39 1000010
40 1000011
41 1000100
42 1000101
43 1000110
44 1001000
45 1001010
46 1001100
47 1010000

List of values

[0, 1, 10, 11, 100, 101, 110, 1000, 1001, 1010, 1011, 1100, 1101, 10000, 10001, 10010, 10011, 10100, 10110, 11000, 11001, 11010, 100000, 100001, 100010, 100011, 100100, 100101, 100110, 101000, 101001, 101100, 110000, 110001, 110010, 110100, 1000000, 1000001, 1000010, 1000011, 1000100, 1000101, 1000110, 1001000, 1001010, 1001100, 1010000]

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

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