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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.

A140391 Pythagorean triangle side lengths triples with two lengths prime.

Table of values

n a(n)
1 4
2 3
3 5
4 12
5 5
6 13
7 60
8 11
9 61
10 180
11 19
12 181
13 420
14 29
15 421
16 1740
17 59
18 1741
19 1860
20 61
21 1861
22 2520
23 71
24 2521
25 3120
26 79
27 3121
28 5100
29 101
30 5101
31 8580
32 131
33 8581
34 9660
35 139
36 9661
37 16380
38 181
39 16381
40 19800
41 199
42 19801
43 36720
44 271
45 36721
46 60900
47 349
48 60901
49 71820

List of values

[4, 3, 5, 12, 5, 13, 60, 11, 61, 180, 19, 181, 420, 29, 421, 1740, 59, 1741, 1860, 61, 1861, 2520, 71, 2521, 3120, 79, 3121, 5100, 101, 5101, 8580, 131, 8581, 9660, 139, 9661, 16380, 181, 16381, 19800, 199, 19801, 36720, 271, 36721, 60900, 349, 60901, 71820]

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

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