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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.

A123986 Numbers n for which 4n+1 and 4n+3 are primes.

Table of values

n a(n)
1 1
2 4
3 7
4 10
5 25
6 34
7 37
8 49
9 67
10 70
11 115
12 130
13 142
14 154
15 160
16 202
17 205
18 214
19 220
20 262
21 265
22 307
23 319
24 322
25 325
26 370
27 424
28 430
29 469
30 487
31 499
32 520
33 532
34 535
35 559
36 577
37 595
38 637
39 664
40 682
41 697
42 700
43 742
44 814
45 832
46 847
47 865
48 889
49 895
50 955
51 979
52 982
53 1000
54 1012
55 1039

List of values

[1, 4, 7, 10, 25, 34, 37, 49, 67, 70, 115, 130, 142, 154, 160, 202, 205, 214, 220, 262, 265, 307, 319, 322, 325, 370, 424, 430, 469, 487, 499, 520, 532, 535, 559, 577, 595, 637, 664, 682, 697, 700, 742, 814, 832, 847, 865, 889, 895, 955, 979, 982, 1000, 1012, 1039]

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

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