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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.

A064983 a(n) is the smallest prime p such that p*n! - 1 is prime.

Table of values

n a(n)
0 3
1 3
2 2
3 2
4 2
5 2
6 2
7 2
8 5
9 3
10 29
11 11
12 3
13 5
14 2
15 2
16 53
17 2
18 67
19 79
20 5
21 61
22 2
23 7
24 13
25 5
26 3
27 11
28 2
29 107
30 43
31 7
32 31
33 199
34 293
35 17
36 43
37 197
38 109
39 41
40 13
41 277
42 11
43 167
44 17
45 83
46 157
47 31
48 199
49 131
50 13
51 5
52 89
53 47
54 223
55 83
56 43
57 7
58 139
59 151
60 211
61 19
62 19
63 23
64 43
65 311
66 61
67 53
68 191
69 163
70 11

List of values

[3, 3, 2, 2, 2, 2, 2, 2, 5, 3, 29, 11, 3, 5, 2, 2, 53, 2, 67, 79, 5, 61, 2, 7, 13, 5, 3, 11, 2, 107, 43, 7, 31, 199, 293, 17, 43, 197, 109, 41, 13, 277, 11, 167, 17, 83, 157, 31, 199, 131, 13, 5, 89, 47, 223, 83, 43, 7, 139, 151, 211, 19, 19, 23, 43, 311, 61, 53, 191, 163, 11]

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

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