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.

A304246 Numbers that yield a prime whenever a '1' is inserted between any two digits.

Table of values

n a(n)
1 0
2 1
3 2
4 3
5 4
6 5
7 6
8 7
9 8
10 9
11 13
12 21
13 31
14 33
15 37
16 49
17 63
18 67
19 69
20 79
21 81
22 91
23 99
24 103
25 109
26 117
27 123
28 151
29 163
30 181
31 193
32 211
33 213
34 231
35 241
36 279
37 309
38 319
39 363
40 367
41 391
42 411
43 427
44 429
45 453
46 457
47 459
48 501
49 513
50 519
51 547
52 571
53 601
54 613
55 621
56 631
57 697
58 703
59 709
60 721
61 729
62 777
63 787
64 801
65 811
66 817
67 879
68 903
69 951
70 981
71 987

List of values

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 13, 21, 31, 33, 37, 49, 63, 67, 69, 79, 81, 91, 99, 103, 109, 117, 123, 151, 163, 181, 193, 211, 213, 231, 241, 279, 309, 319, 363, 367, 391, 411, 427, 429, 453, 457, 459, 501, 513, 519, 547, 571, 601, 613, 621, 631, 697, 703, 709, 721, 729, 777, 787, 801, 811, 817, 879, 903, 951, 981, 987]