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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.

A260519 Concatenate the positions of digits 0, 1,..., 9 in the decimal representation of n, using 1 for the rightmost digit etc., and 0 when the digit does not occur.

Table of values

n a(n)
0 1000000000
1 100000000
2 10000000
3 1000000
4 100000
5 10000
6 1000
7 100
8 10
9 1
10 1200000000
11 1200000000
12 210000000
13 201000000
14 200100000
15 200010000
16 200001000
17 200000100
18 200000010
19 200000001
20 1020000000
21 120000000
22 120000000
23 21000000
24 20100000
25 20010000
26 20001000
27 20000100
28 20000010
29 20000001

List of values

[1000000000, 100000000, 10000000, 1000000, 100000, 10000, 1000, 100, 10, 1, 1200000000, 1200000000, 210000000, 201000000, 200100000, 200010000, 200001000, 200000100, 200000010, 200000001, 1020000000, 120000000, 120000000, 21000000, 20100000, 20010000, 20001000, 20000100, 20000010, 20000001]

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

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