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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.

A359124 Concatenate the decimal numbers 1,2,3,...,n, then add 1.

Table of values

n a(n)
1 2
2 13
3 124
4 1235
5 12346
6 123457
7 1234568
8 12345679
9 123456790
10 12345678911
11 1234567891012
12 123456789101113
13 12345678910111214
14 1234567891011121315
15 123456789101112131416
16 12345678910111213141517
17 1234567891011121314151618
18 123456789101112131415161719
19 12345678910111213141516171820

List of values

[2, 13, 124, 1235, 12346, 123457, 1234568, 12345679, 123456790, 12345678911, 1234567891012, 123456789101113, 12345678910111214, 1234567891011121315, 123456789101112131416, 12345678910111213141517, 1234567891011121314151618, 123456789101112131415161719, 12345678910111213141516171820]

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

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