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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.

A158191 Attach the smallest prime to the end of the string a(n-1) so a(n) is also prime.

Table of values

n a(n)
1 2
2 23
3 233
4 2333
5 23333
6 2333323
7 23333237
8 233332373
9 23333237353
10 2333323735319
11 2333323735319149
12 2333323735319149571
13 23333237353191495713
14 23333237353191495713131
15 233332373531914957131313

List of values

[2, 23, 233, 2333, 23333, 2333323, 23333237, 233332373, 23333237353, 2333323735319, 2333323735319149, 2333323735319149571, 23333237353191495713, 23333237353191495713131, 233332373531914957131313]

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

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