cp's OEIS Frontend

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.

A376209 Numbers k for which the hypotenuse z=4*k+1 occurs in more than one primitive Pythagorean triangle, such that 2 distinct triangles (x1,y1,z), (x2,y2,z) with opposite parity of their short legs x1 and x2 exist (xi < yi < z).

Table of values

n a(n)
1 16
2 21
3 36
4 46
5 51
6 55
7 66
8 76
9 91
10 94
11 111
12 121
13 123
14 126
15 136
16 157
17 171
18 172
19 181
20 186
21 196
22 211
23 216
24 225
25 237
26 241
27 246
28 268
29 276
30 286
31 289
32 291
33 297
34 301
35 310
36 315
37 331
38 336
39 346
40 351
41 354
42 361
43 366
44 378
45 384
46 396
47 412
48 421
49 436
50 441
51 442
52 445
53 456
54 463
55 466

List of values

[16, 21, 36, 46, 51, 55, 66, 76, 91, 94, 111, 121, 123, 126, 136, 157, 171, 172, 181, 186, 196, 211, 216, 225, 237, 241, 246, 268, 276, 286, 289, 291, 297, 301, 310, 315, 331, 336, 346, 351, 354, 361, 366, 378, 384, 396, 412, 421, 436, 441, 442, 445, 456, 463, 466]

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

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