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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.

A268607 a(n) is the least m > 1 such that 2^n - m is prime.

Table of values

n a(n)
2 2
3 3
4 3
5 3
6 3
7 15
8 5
9 3
10 3
11 9
12 3
13 13
14 3
15 19
16 15
17 9
18 5
19 19
20 3
21 9
22 3
23 15
24 3
25 39
26 5
27 39
28 57
29 3
30 35
31 19
32 5
33 9
34 41
35 31
36 5
37 25
38 45
39 7
40 87
41 21
42 11
43 57
44 17
45 55
46 21
47 115
48 59
49 81
50 27
51 129
52 47
53 111
54 33
55 55
56 5
57 13
58 27
59 55
60 93
61 31
62 57
63 25
64 59
65 49
66 5
67 19
68 23
69 19
70 35
71 231
72 93

List of values

[2, 3, 3, 3, 3, 15, 5, 3, 3, 9, 3, 13, 3, 19, 15, 9, 5, 19, 3, 9, 3, 15, 3, 39, 5, 39, 57, 3, 35, 19, 5, 9, 41, 31, 5, 25, 45, 7, 87, 21, 11, 57, 17, 55, 21, 115, 59, 81, 27, 129, 47, 111, 33, 55, 5, 13, 27, 55, 93, 31, 57, 25, 59, 49, 5, 19, 23, 19, 35, 231, 93]

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

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