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.

A056656 Numbers k such that 20*R_k + 3 is prime, where R_k = 11...1 is the repunit (A002275) of length k.

Table of values

n a(n)
1 0
2 1
3 2
4 7
5 10
6 35
7 94
8 100
9 127
10 259
11 350
12 466
13 644
14 1010
15 1177
16 1216
17 2441
18 3760
19 3805
20 15616
21 26458
22 63116
23 88544
24 93496

List of values

[0, 1, 2, 7, 10, 35, 94, 100, 127, 259, 350, 466, 644, 1010, 1177, 1216, 2441, 3760, 3805, 15616, 26458, 63116, 88544, 93496]