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.

A200921 Least k such that (3^n + k)*3^n - 1 is a prime number.

Table of values

n a(n)
1 1
2 1
3 3
4 3
5 13
6 9
7 15
8 3
9 1
10 13
11 29
12 1
13 5
14 53
15 25
16 9
17 23
18 1
19 69
20 13
21 3
22 3
23 17
24 1
25 5
26 117
27 5
28 13
29 45
30 51
31 3
32 11
33 31
34 73
35 49
36 43
37 11
38 83
39 93
40 277
41 171
42 383
43 39
44 11
45 3
46 31
47 55
48 61
49 61
50 13
51 73
52 107
53 65
54 137
55 53
56 39
57 467
58 53
59 233
60 277
61 17
62 53
63 109
64 177
65 151
66 97
67 13

List of values

[1, 1, 3, 3, 13, 9, 15, 3, 1, 13, 29, 1, 5, 53, 25, 9, 23, 1, 69, 13, 3, 3, 17, 1, 5, 117, 5, 13, 45, 51, 3, 11, 31, 73, 49, 43, 11, 83, 93, 277, 171, 383, 39, 11, 3, 31, 55, 61, 61, 13, 73, 107, 65, 137, 53, 39, 467, 53, 233, 277, 17, 53, 109, 177, 151, 97, 13]

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

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