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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.

A373041 2*a(n) is the number of triangles with integer sides (x, y, n), x < y < n, and gcd(x, y, n) = 1.

Table of values

n a(n)
5 1
6 2
7 3
8 4
9 6
10 7
11 10
12 10
13 15
14 15
15 20
16 20
17 28
18 24
19 36
20 32
21 42
22 40
23 55
24 44
25 65
26 57
27 72
28 66
29 91
30 68
31 105
32 88
33 110
34 100
35 132
36 102
37 153
38 126
39 156
40 136
41 190
42 138
43 210
44 170
45 204
46 187
47 253
48 184
49 273
50 215
51 272
52 240
53 325
54 234
55 340
56 276
57 342
58 301
59 406
60 280
61 435
62 345
63 414
64 368
65 480

List of values

[1, 2, 3, 4, 6, 7, 10, 10, 15, 15, 20, 20, 28, 24, 36, 32, 42, 40, 55, 44, 65, 57, 72, 66, 91, 68, 105, 88, 110, 100, 132, 102, 153, 126, 156, 136, 190, 138, 210, 170, 204, 187, 253, 184, 273, 215, 272, 240, 325, 234, 340, 276, 342, 301, 406, 280, 435, 345, 414, 368, 480]

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

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