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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.

A166733 Numbers n with the property that the concatenation of the trivial divisors of n (i.e., 1 and n) is a prime.

Table of values

n a(n)
1 3
2 7
3 9
4 13
5 27
6 31
7 37
8 39
9 49
10 51
11 57
12 63
13 67
14 73
15 79
16 81
17 91
18 93
19 97
20 99
21 103
22 109
23 117
24 123
25 129
26 151
27 153
28 163
29 171
30 181
31 187
32 193
33 201
34 213
35 217
36 223
37 229
38 231
39 237
40 249
41 259
42 277
43 279
44 283
45 289
46 291
47 297
48 301
49 303
50 307
51 319
52 321
53 327
54 361
55 367
56 373
57 381

List of values

[3, 7, 9, 13, 27, 31, 37, 39, 49, 51, 57, 63, 67, 73, 79, 81, 91, 93, 97, 99, 103, 109, 117, 123, 129, 151, 153, 163, 171, 181, 187, 193, 201, 213, 217, 223, 229, 231, 237, 249, 259, 277, 279, 283, 289, 291, 297, 301, 303, 307, 319, 321, 327, 361, 367, 373, 381]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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