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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.

A354569 Ordered even leg lengths k (listed with multiplicity) of primitive Pythagorean triangles such that all odd prime factors of k are congruent to 1 (mod 4) and at least one prime factor is congruent to 1 (mod 4).

Table of values

n a(n)
1 20
2 20
3 40
4 40
5 52
6 52
7 68
8 68
9 80
10 80
11 100
12 100
13 104
14 104
15 116
16 116
17 136
18 136
19 148
20 148
21 160
22 160
23 164
24 164
25 200
26 200
27 208
28 208
29 212
30 212
31 232
32 232
33 244
34 244
35 260
36 260
37 260
38 260
39 272
40 272
41 292
42 292
43 296
44 296
45 320
46 320
47 328
48 328
49 340
50 340
51 340
52 340
53 356
54 356

List of values

[20, 20, 40, 40, 52, 52, 68, 68, 80, 80, 100, 100, 104, 104, 116, 116, 136, 136, 148, 148, 160, 160, 164, 164, 200, 200, 208, 208, 212, 212, 232, 232, 244, 244, 260, 260, 260, 260, 272, 272, 292, 292, 296, 296, 320, 320, 328, 328, 340, 340, 340, 340, 356, 356]

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

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