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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.

A068648 Primes in which a string of 8's is sandwiched between two 1's.

Table of values

n a(n)
1 11
2 181
3 188888881
4 188888888888881
5 18888888888888888888888888888888888888881
6 188888888888888888888888888888888888888888888888888888888888888888888888888888888888888888881

List of values

[11, 181, 188888881, 188888888888881, 18888888888888888888888888888888888888881, 188888888888888888888888888888888888888888888888888888888888888888888888888888888888888888881]

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

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