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.

A056701 Numbers k such that 2*10^k + 3*R_k 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 4
6 10
7 16
8 22
9 53
10 91
11 94
12 106
13 138
14 210
15 282
16 522
17 597
18 1049
19 2227
20 6459
21 10582
22 18895
23 41269
24 50702
25 53185
26 59796
27 101395
28 116514
29 137551
30 153116

List of values

[0, 1, 2, 3, 4, 10, 16, 22, 53, 91, 94, 106, 138, 210, 282, 522, 597, 1049, 2227, 6459, 10582, 18895, 41269, 50702, 53185, 59796, 101395, 116514, 137551, 153116]