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.

A096506 Numbers n for which 2*R_n + 1 is a prime, where R_n = 11...1 is the repunit (A002275) of length n.

Table of values

n a(n)
1 1
2 2
3 3
4 8
5 11
6 36
7 95
8 101
9 128
10 260
11 351
12 467
13 645
14 1011
15 1178
16 1217
17 2442
18 3761
19 3806
20 15617
21 26459
22 63117
23 88545
24 93497

List of values

[1, 2, 3, 8, 11, 36, 95, 101, 128, 260, 351, 467, 645, 1011, 1178, 1217, 2442, 3761, 3806, 15617, 26459, 63117, 88545, 93497]