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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.

A302564 a(n) is the greatest prime p such that (2*n+1-p)/2 is prime.

Table of values

n a(n)
3 3
4 5
5 7
6 7
7 11
8 13
9 13
10 17
11 19
12 19
13 23
14 23
15 17
16 29
17 31
18 31
19 29
20 37
21 37
22 41
23 43
24 43
25 47
26 47
27 41
28 53
29 53
30 47
31 59
32 61
33 61
34 59
35 67
36 67
37 71
38 73
39 73
40 71
41 79
42 79
43 83
44 83
45 53
46 89
47 89
48 83
49 89
50 97
51 97
52 101
53 103
54 103
55 107
56 109
57 109
58 113
59 113
60 107
61 113
62 103
63 113
64 107
65 127
66 127
67 131
68 131
69 113
70 137
71 139
72 139

List of values

[3, 5, 7, 7, 11, 13, 13, 17, 19, 19, 23, 23, 17, 29, 31, 31, 29, 37, 37, 41, 43, 43, 47, 47, 41, 53, 53, 47, 59, 61, 61, 59, 67, 67, 71, 73, 73, 71, 79, 79, 83, 83, 53, 89, 89, 83, 89, 97, 97, 101, 103, 103, 107, 109, 109, 113, 113, 107, 113, 103, 113, 107, 127, 127, 131, 131, 113, 137, 139, 139]

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

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