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.

A373351 Numbers k such that there are no primes among the k-digit numbers consisting of one 1 and all other digits 9.

Table of values

n a(n)
1 1
2 9
3 18
4 21
5 34
6 35
7 36
8 39
9 49
10 62
11 63
12 69
13 70
14 73
15 78
16 80
17 86
18 93
19 99
20 102
21 116
22 122
23 123
24 141
25 142
26 143
27 146
28 147
29 150
30 178
31 182
32 185
33 201
34 206
35 223
36 230
37 236
38 238
39 241
40 246
41 251
42 267
43 279
44 285
45 292
46 293
47 304
48 309
49 313
50 321
51 326
52 329
53 343
54 346
55 347
56 350
57 355
58 362
59 375
60 380
61 381
62 385
63 389
64 398

List of values

[1, 9, 18, 21, 34, 35, 36, 39, 49, 62, 63, 69, 70, 73, 78, 80, 86, 93, 99, 102, 116, 122, 123, 141, 142, 143, 146, 147, 150, 178, 182, 185, 201, 206, 223, 230, 236, 238, 241, 246, 251, 267, 279, 285, 292, 293, 304, 309, 313, 321, 326, 329, 343, 346, 347, 350, 355, 362, 375, 380, 381, 385, 389, 398]