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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.

A120213 "a" values providing solution x != b in A120211, i.e., in y^2 = x*(a^2 - x)*(b^2 + x) with a, b legs in primitive Pythagorean triads.

Table of values

n a(n)
0 4
1 12
2 12
3 15
4 15
5 16
6 20
7 20
8 21
9 24
10 24
11 28
12 28
13 32
14 33
15 35
16 36
17 36
18 39
19 40
20 40
21 44
22 44
23 45
24 48
25 48
26 51
27 52
28 52
29 55
30 56
31 56
32 57
33 60
34 60
35 60
36 60
37 63
38 64
39 65
40 68
41 68
42 69
43 72
44 72
45 75
46 76
47 76
48 77
49 77

List of values

[4, 12, 12, 15, 15, 16, 20, 20, 21, 24, 24, 28, 28, 32, 33, 35, 36, 36, 39, 40, 40, 44, 44, 45, 48, 48, 51, 52, 52, 55, 56, 56, 57, 60, 60, 60, 60, 63, 64, 65, 68, 68, 69, 72, 72, 75, 76, 76, 77, 77]

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

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