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.

A077715 a(1) = 7; thereafter a(n) = the smallest prime of the form d0...0a(n-1), where d is a single digit, or 0 if no such prime exists.

Table of values

n a(n)
1 7
2 17
3 317
4 6317
5 26317
6 126317
7 2126317
8 72126317
9 372126317
10 5372126317
11 305372126317
12 9305372126317
13 409305372126317
14 20409305372126317
15 100020409305372126317
16 9100020409305372126317
17 209100020409305372126317
18 40209100020409305372126317

List of values

[7, 17, 317, 6317, 26317, 126317, 2126317, 72126317, 372126317, 5372126317, 305372126317, 9305372126317, 409305372126317, 20409305372126317, 100020409305372126317, 9100020409305372126317, 209100020409305372126317, 40209100020409305372126317]

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

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