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.

A002731 Numbers k such that (k^2 + 1)/2 is prime.

Table of values

n a(n)
1 3
2 5
3 9
4 11
5 15
6 19
7 25
8 29
9 35
10 39
11 45
12 49
13 51
14 59
15 61
16 65
17 69
18 71
19 79
20 85
21 95
22 101
23 121
24 131
25 139
26 141
27 145
28 159
29 165
30 169
31 171
32 175
33 181
34 195
35 199
36 201
37 205
38 209
39 219
40 221
41 231
42 245
43 261
44 271
45 275
46 279
47 289
48 299
49 309
50 315
51 321
52 325
53 329
54 335
55 345
56 349
57 371
58 375
59 379
60 391
61 399
62 405

List of values

[3, 5, 9, 11, 15, 19, 25, 29, 35, 39, 45, 49, 51, 59, 61, 65, 69, 71, 79, 85, 95, 101, 121, 131, 139, 141, 145, 159, 165, 169, 171, 175, 181, 195, 199, 201, 205, 209, 219, 221, 231, 245, 261, 271, 275, 279, 289, 299, 309, 315, 321, 325, 329, 335, 345, 349, 371, 375, 379, 391, 399, 405]

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

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