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.

A260522 Concatenate the positions of digits 9, 8,..., 0 in the decimal representation of n, using 1 for the leftmost digit etc., and 0 when the digit does not occur.

Table of values

n a(n)
0 1
1 10
2 100
3 1000
4 10000
5 100000
6 1000000
7 10000000
8 100000000
9 1000000000
10 12
11 120
12 210
13 2010
14 20010
15 200010
16 2000010
17 20000010
18 200000010
19 2000000010
20 102
21 120
22 1200
23 2100
24 20100
25 200100
26 2000100
27 20000100
28 200000100
29 2000000100

List of values

[1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000, 12, 120, 210, 2010, 20010, 200010, 2000010, 20000010, 200000010, 2000000010, 102, 120, 1200, 2100, 20100, 200100, 2000100, 20000100, 200000100, 2000000100]

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

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