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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.

A262299 Let S(n) denote the sequence formed by concatenating the decimal numbers 1,2,3,..., omitting n; a(n) is the smallest prime in S(n), or -1 if no term in S(n) is prime.

Table of values

n a(n)
1 2
2 13
3 124567
4 12356789
5 123467891011
6 123457
7 123456891011

List of values

[2, 13, 124567, 12356789, 123467891011, 123457, 123456891011]

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

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