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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.

A174583 a(k) is the least n such that the concatenation (n - k)"n is a prime number, for k >= 0.

Table of values

n a(n)
0 1
1 3
2 3
3 7
4 7
5 17
6 7
7 9
8 9
9 11
10 13
11 17
12 13
13 19
14 17
15 19
16 21
17 21
18 23
19 27
20 27
21 23
22 43
23 33
24 41
25 27
26 27
27 29
28 31
29 33
30 31
31 33
32 39
33 47
34 37
35 39
36 37
37 39
38 39
39 41
40 51
41 47
42 47
43 61
44 47
45 49
46 49
47 53
48 49
49 51
50 51
51 59
52 57
53 57
54 61
55 57
56 57
57 61
58 63
59 63
60 71
61 63
62 63
63 67
64 67
65 77
66 67
67 69
68 77
69 71
70 73
71 77

List of values

[1, 3, 3, 7, 7, 17, 7, 9, 9, 11, 13, 17, 13, 19, 17, 19, 21, 21, 23, 27, 27, 23, 43, 33, 41, 27, 27, 29, 31, 33, 31, 33, 39, 47, 37, 39, 37, 39, 39, 41, 51, 47, 47, 61, 47, 49, 49, 53, 49, 51, 51, 59, 57, 57, 61, 57, 57, 61, 63, 63, 71, 63, 63, 67, 67, 77, 67, 69, 77, 71, 73, 77]

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

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