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.

A136859 Numbers k such that k and k^2 use only the digits 0, 1, 4 and 6.

Table of values

n a(n)
1 0
2 1
3 4
4 10
5 40
6 100
7 400
8 1000
9 4000
10 10000
11 40000
12 100000
13 400000
14 1000000
15 4000000
16 10000000
17 40000000
18 100000000
19 400000000
20 1000000000
21 4000000000
22 10000000000
23 40000000000
24 100000000000
25 400000000000
26 1000000000000
27 4000000000000
28 10000000000000
29 40000000000000
30 100000000000000
31 400000000000000

List of values

[0, 1, 4, 10, 40, 100, 400, 1000, 4000, 10000, 40000, 100000, 400000, 1000000, 4000000, 10000000, 40000000, 100000000, 400000000, 1000000000, 4000000000, 10000000000, 40000000000, 100000000000, 400000000000, 1000000000000, 4000000000000, 10000000000000, 40000000000000, 100000000000000, 400000000000000]

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

Content is available under The OEIS End-User License Agreement.