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.

A202997 a(1) = 3 ; a(n+1) is the prime number obtained by the concatenation {p, a(n)} where p is the smallest prime prefix.

Table of values

n a(n)
1 3
2 23
3 223
4 31223
5 231223
6 31231223
7 2931231223
8 372931231223
9 17372931231223
10 1317372931231223
11 1971317372931231223
12 1571971317372931231223
13 891571971317372931231223
14 79891571971317372931231223
15 25179891571971317372931231223
16 4325179891571971317372931231223

List of values

[3, 23, 223, 31223, 231223, 31231223, 2931231223, 372931231223, 17372931231223, 1317372931231223, 1971317372931231223, 1571971317372931231223, 891571971317372931231223, 79891571971317372931231223, 25179891571971317372931231223, 4325179891571971317372931231223]

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

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