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.

A032670 Digit '7' concatenated with a(n) is a prime.

Table of values

n a(n)
1 1
2 3
3 9
4 19
5 27
6 33
7 39
8 43
9 51
10 57
11 61
12 69
13 73
14 87
15 97
16 103
17 109
18 121
19 127
20 129
21 151
22 159
23 177
24 187
25 193
26 207
27 211
28 213
29 219
30 229
31 237
32 243
33 247
34 253
35 283
36 297
37 307
38 309
39 321
40 331
41 333
42 349
43 351
44 369
45 393
46 411
47 417
48 433
49 451
50 457
51 459
52 477
53 481

List of values

[1, 3, 9, 19, 27, 33, 39, 43, 51, 57, 61, 69, 73, 87, 97, 103, 109, 121, 127, 129, 151, 159, 177, 187, 193, 207, 211, 213, 219, 229, 237, 243, 247, 253, 283, 297, 307, 309, 321, 331, 333, 349, 351, 369, 393, 411, 417, 433, 451, 457, 459, 477, 481]