cp's OEIS Frontend

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.

A280846 Numbers k such that all four of the numbers 2^k +- 2k +- 1 are nonprime.

Table of values

n a(n)
1 9
2 10
3 16
4 17
5 19
6 20
7 21
8 22
9 23
10 24
11 26
12 29
13 30
14 33
15 34
16 36
17 37
18 38
19 39
20 40
21 42
22 43
23 44
24 45
25 46
26 47
27 48
28 49
29 52
30 53
31 54
32 55
33 56
34 57
35 58
36 59
37 60
38 61
39 62
40 63
41 64
42 66
43 67
44 68
45 69
46 70
47 71
48 72
49 73
50 74
51 75
52 76
53 77
54 78
55 79
56 80
57 82
58 83
59 84
60 86
61 87
62 88
63 89
64 90
65 91

List of values

[9, 10, 16, 17, 19, 20, 21, 22, 23, 24, 26, 29, 30, 33, 34, 36, 37, 38, 39, 40, 42, 43, 44, 45, 46, 47, 48, 49, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 82, 83, 84, 86, 87, 88, 89, 90, 91]

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

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