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.

A102940 Numbers k such that 10^k + 6*R_k + 1 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 3
5 5
6 9
7 11
8 14
9 32
10 54
11 55
12 60
13 153
14 200
15 461
16 569
17 840
18 847
19 1296
20 1356
21 2007
22 2627
23 2847
24 3110
25 6876
26 9161
27 17765
28 33555
29 59142
30 65773
31 280710

List of values

[0, 1, 2, 3, 5, 9, 11, 14, 32, 54, 55, 60, 153, 200, 461, 569, 840, 847, 1296, 1356, 2007, 2627, 2847, 3110, 6876, 9161, 17765, 33555, 59142, 65773, 280710]