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.

A215420 Primes that remain prime when a single digit 7 is inserted between any two consecutive digits or as the leading or trailing digit.

Table of values

n a(n)
1 3
2 19
3 97
4 433
5 487
6 541
7 691
8 757
9 853
10 1471
11 2617
12 2953
13 4507
14 6481
15 7351
16 7417
17 8317
18 13177
19 31957
20 42457
21 46477
22 47977
23 50077
24 59053
25 71917
26 73897
27 74377
28 77479
29 77743
30 77761
31 79039
32 99103
33 175687
34 220897
35 271177
36 360973

List of values

[3, 19, 97, 433, 487, 541, 691, 757, 853, 1471, 2617, 2953, 4507, 6481, 7351, 7417, 8317, 13177, 31957, 42457, 46477, 47977, 50077, 59053, 71917, 73897, 74377, 77479, 77743, 77761, 79039, 99103, 175687, 220897, 271177, 360973]