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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.

A143697 Least square k^2 such that n^2-k^2 = p*q with p and q odd primes and p for n>= 4.

Table of values

n a(n)
4 1
5 4
6 1
7 16
8 9
9 4
10 9
11 36
12 1
13 36
14 9
15 4
16 9
17 36
18 1
19 144
20 9
21 4
22 81
23 36
24 25
25 36
26 9
27 16
28 81
29 144
30 1
31 144
32 81
33 16
34 9
35 36
36 25
37 36
38 81
39 4
40 9
41 144
42 1
43 576
44 9
45 4
46 225
47 36
48 25
49 144
50 9
51 64
52 81
53 36
54 49
55 144
56 9
57 16
58 225
59 144
60 1
61 324
62 81
63 16
64 9
65 36
66 25
67 36
68 225
69 4
70 9
71 144
72 1
73 36
74 225

List of values

[1, 4, 1, 16, 9, 4, 9, 36, 1, 36, 9, 4, 9, 36, 1, 144, 9, 4, 81, 36, 25, 36, 9, 16, 81, 144, 1, 144, 81, 16, 9, 36, 25, 36, 81, 4, 9, 144, 1, 576, 9, 4, 225, 36, 25, 144, 9, 64, 81, 36, 49, 144, 9, 16, 225, 144, 1, 324, 81, 16, 9, 36, 25, 36, 225, 4, 9, 144, 1, 36, 225]

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

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