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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.

A193890 Primes p such that replacing any single decimal digit d with 3*d produces another prime (obviously p can contain only digits 0, 1, 2 or 3).

Table of values

n a(n)
1 11
2 311
3 1301
4 10133
5 1030031

List of values

[11, 311, 1301, 10133, 1030031]

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

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