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.

A110680 Numbers k such that the string 4444k is prime.

Table of values

n a(n)
1 9
2 21
3 43
4 49
5 61
6 63
7 69
8 73
9 87
10 109
11 127
12 147
13 159
14 169
15 171
16 201
17 207
18 213
19 217
20 229
21 241
22 261
23 289
24 291
25 331
26 339
27 357
28 369
29 381
30 397
31 409
32 469
33 471
34 483
35 487
36 507
37 519
38 549
39 591
40 607
41 621
42 639
43 663
44 669
45 697
46 703
47 711
48 717
49 729
50 747

List of values

[9, 21, 43, 49, 61, 63, 69, 73, 87, 109, 127, 147, 159, 169, 171, 201, 207, 213, 217, 229, 241, 261, 289, 291, 331, 339, 357, 369, 381, 397, 409, 469, 471, 483, 487, 507, 519, 549, 591, 607, 621, 639, 663, 669, 697, 703, 711, 717, 729, 747]