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.

A036938 Smallest n-digit prime containing only digits 2 and 7, or 0 if no such prime exists.

Table of values

n a(n)
1 2
2 0
3 227
4 2777
5 22277
6 272227
7 2227727
8 22227277
9 222222227
10 2222222777
11 22222222277
12 222222272777
13 2222222227727
14 22222222777277
15 222222222222227
16 2222222222227727
17 22222222222227227
18 222222222227227727

List of values

[2, 0, 227, 2777, 22277, 272227, 2227727, 22227277, 222222227, 2222222777, 22222222277, 222222272777, 2222222227727, 22222222777277, 222222222222227, 2222222222227727, 22222222222227227, 222222222227227727]

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

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