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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.

A262572 Concatenation of the numbers from 1 to n but omitting 2.

Table of values

n a(n)
1 1
2 13
3 134
4 1345
5 13456
6 134567
7 1345678
8 13456789
9 1345678910
10 134567891011
11 13456789101112
12 1345678910111213
13 134567891011121314
14 13456789101112131415
15 1345678910111213141516
16 134567891011121314151617
17 13456789101112131415161718
18 1345678910111213141516171819
19 134567891011121314151617181920

List of values

[1, 13, 134, 1345, 13456, 134567, 1345678, 13456789, 1345678910, 134567891011, 13456789101112, 1345678910111213, 134567891011121314, 13456789101112131415, 1345678910111213141516, 134567891011121314151617, 13456789101112131415161718, 1345678910111213141516171819, 134567891011121314151617181920]

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

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