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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.

A257410 Values of n such that there are exactly 3 solutions to x^2 - y^2 = n with x > y >= 0.

Table of values

n a(n)
1 45
2 48
3 63
4 64
5 72
6 75
7 80
8 81
9 99
10 112
11 117
12 128
13 147
14 153
15 171
16 175
17 176
18 180
19 200
20 207
21 208
22 243
23 245
24 252
25 261
26 272
27 275
28 279
29 300
30 304
31 324
32 325
33 333
34 363
35 368
36 369
37 387
38 392
39 396
40 423
41 425
42 464
43 468
44 475
45 477
46 496
47 507
48 531
49 539
50 549
51 575
52 588
53 592

List of values

[45, 48, 63, 64, 72, 75, 80, 81, 99, 112, 117, 128, 147, 153, 171, 175, 176, 180, 200, 207, 208, 243, 245, 252, 261, 272, 275, 279, 300, 304, 324, 325, 333, 363, 368, 369, 387, 392, 396, 423, 425, 464, 468, 475, 477, 496, 507, 531, 539, 549, 575, 588, 592]