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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.

A120427 For each y >= 1 there are only finitely many values of x >= 1 such that x-y and x+y are both squares; list all such pairs (x,y) with gcd(x,y) = 1 ordered by values of y; sequence gives y values.

Table of values

n a(n)
1 4
2 8
3 12
4 12
5 16
6 20
7 20
8 24
9 24
10 28
11 28
12 32
13 36
14 36
15 40
16 40
17 44
18 44
19 48
20 48
21 52
22 52
23 56
24 56
25 60
26 60
27 60
28 60
29 64
30 68
31 68
32 72
33 72
34 76
35 76
36 80
37 80
38 84
39 84
40 84
41 84
42 88
43 88
44 92
45 92
46 96
47 96
48 100
49 100
50 104
51 104
52 108
53 108
54 112
55 112
56 116
57 116
58 120
59 120
60 120
61 120
62 124
63 124
64 128

List of values

[4, 8, 12, 12, 16, 20, 20, 24, 24, 28, 28, 32, 36, 36, 40, 40, 44, 44, 48, 48, 52, 52, 56, 56, 60, 60, 60, 60, 64, 68, 68, 72, 72, 76, 76, 80, 80, 84, 84, 84, 84, 88, 88, 92, 92, 96, 96, 100, 100, 104, 104, 108, 108, 112, 112, 116, 116, 120, 120, 120, 120, 124, 124, 128]

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

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