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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.

A228325 a(n) is the smallest number m>n such that the concatenation nm is prime.

Table of values

n a(n)
1 3
2 3
3 7
4 7
5 9
6 7
7 9
8 9
9 11
10 13
11 17
12 13
13 19
14 23
15 23
16 19
17 21
18 23
19 31
20 27
21 29
22 37
23 33
24 37
25 31
26 33
27 29
28 33
29 39
30 37
31 37
32 51
33 43
34 49
35 39
36 37
37 39
38 47
39 43
40 49
41 53
42 43
43 49
44 47
45 47
46 49
47 51
48 61
49 51
50 51
51 53
52 61
53 81
54 71
55 57
56 57
57 79
58 61
59 81
60 67
61 63
62 63
63 67
64 69
65 69
66 73
67 79

List of values

[3, 3, 7, 7, 9, 7, 9, 9, 11, 13, 17, 13, 19, 23, 23, 19, 21, 23, 31, 27, 29, 37, 33, 37, 31, 33, 29, 33, 39, 37, 37, 51, 43, 49, 39, 37, 39, 47, 43, 49, 53, 43, 49, 47, 47, 49, 51, 61, 51, 51, 53, 61, 81, 71, 57, 57, 79, 61, 81, 67, 63, 63, 67, 69, 69, 73, 79]

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

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