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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.

A068649 Primes in which a string of 9's is sandwiched between two 1's.

Table of values

n a(n)
1 11
2 191
3 19991
4 199999991
5 19999999999999999999999999999999999999991
6 199999999999999999999999999999999999999999999999999999999999999999999999999999999999991

List of values

[11, 191, 19991, 199999991, 19999999999999999999999999999999999999991, 199999999999999999999999999999999999999999999999999999999999999999999999999999999999991]

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

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