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.

A056686 Numbers k such that 50*R_k + 7 is prime, where R_k = 11...1 is the repunit (A002275) of length k.

Table of values

n a(n)
1 0
2 2
3 3
4 5
5 9
6 14
7 21
8 87
9 206
10 527
11 959
12 2099
13 18521
14 36782
15 38516

List of values

[0, 2, 3, 5, 9, 14, 21, 87, 206, 527, 959, 2099, 18521, 36782, 38516]