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.

A099418 Numbers k such that 5*R_k + 4 is prime, where R_k = 11...1 is the repunit (A002275) of length k.

Table of values

n a(n)
1 2
2 8
3 12
4 18
5 26
6 32
7 138
8 188
9 222
10 338
11 1002
12 2744
13 6530
14 38690
15 39464
16 335480
17 343734

List of values

[2, 8, 12, 18, 26, 32, 138, 188, 222, 338, 1002, 2744, 6530, 38690, 39464, 335480, 343734]