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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.

A200920 Least k such that (3^n+ k)*3^n + 1 is a prime number.

Table of values

n a(n)
1 1
2 3
3 1
4 5
5 3
6 25
7 11
8 5
9 13
10 13
11 9
12 7
13 3
14 9
15 17
16 7
17 29
18 25
19 71
20 49
21 7
22 9
23 7
24 9
25 11
26 39
27 7
28 25
29 107
30 3
31 67
32 59
33 49
34 89
35 67
36 29
37 113
38 5
39 33
40 7
41 19
42 53
43 3
44 5
45 47
46 121
47 39
48 7
49 407
50 25
51 7
52 215
53 29
54 23
55 89
56 5
57 33
58 25
59 113
60 45
61 49
62 109
63 53
64 17
65 109
66 311
67 91
68 145
69 43

List of values

[1, 3, 1, 5, 3, 25, 11, 5, 13, 13, 9, 7, 3, 9, 17, 7, 29, 25, 71, 49, 7, 9, 7, 9, 11, 39, 7, 25, 107, 3, 67, 59, 49, 89, 67, 29, 113, 5, 33, 7, 19, 53, 3, 5, 47, 121, 39, 7, 407, 25, 7, 215, 29, 23, 89, 5, 33, 25, 113, 45, 49, 109, 53, 17, 109, 311, 91, 145, 43]

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

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