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.

A365416 Numbers k such that 2*k-1 and 2*k+1 are both prime powers (A246655).

Table of values

n a(n)
1 2
2 3
3 4
4 5
5 6
6 9
7 12
8 13
9 14
10 15
11 21
12 24
13 30
14 36
15 40
16 41
17 51
18 54
19 63
20 69
21 75
22 84
23 90
24 96
25 99
26 114
27 120
28 121
29 135
30 141
31 156
32 174
33 180
34 210
35 216
36 231
37 261
38 285
39 300
40 309
41 321
42 330
43 364
44 405
45 411
46 414
47 420
48 429
49 441
50 510
51 516
52 525
53 531
54 546
55 576
56 615
57 639
58 645
59 651
60 660
61 684

List of values

[2, 3, 4, 5, 6, 9, 12, 13, 14, 15, 21, 24, 30, 36, 40, 41, 51, 54, 63, 69, 75, 84, 90, 96, 99, 114, 120, 121, 135, 141, 156, 174, 180, 210, 216, 231, 261, 285, 300, 309, 321, 330, 364, 405, 411, 414, 420, 429, 441, 510, 516, 525, 531, 546, 576, 615, 639, 645, 651, 660, 684]

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

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