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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.

A262579 Concatenation of the numbers from 1 to n but omitting 9.

Table of values

n a(n)
1 1
2 12
3 123
4 1234
5 12345
6 123456
7 1234567
8 12345678
9 1234567810
10 123456781011
11 12345678101112
12 1234567810111213
13 123456781011121314
14 12345678101112131415
15 1234567810111213141516
16 123456781011121314151617
17 12345678101112131415161718
18 1234567810111213141516171819
19 123456781011121314151617181920

List of values

[1, 12, 123, 1234, 12345, 123456, 1234567, 12345678, 1234567810, 123456781011, 12345678101112, 1234567810111213, 123456781011121314, 12345678101112131415, 1234567810111213141516, 123456781011121314151617, 12345678101112131415161718, 1234567810111213141516171819, 123456781011121314151617181920]

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

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