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.

A211507 Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2=x*y-n.

Table of values

n a(n)
0 0
1 0
2 0
3 1
4 2
5 3
6 4
7 3
8 9
9 9
10 4
11 17
12 11
13 7
14 18
15 16
16 19
17 21
18 16
19 21
20 35
21 24
22 8
23 35
24 42
25 17
26 44
27 40
28 25
29 47
30 28
31 47
32 56
33 28
34 30
35 76
36 69
37 11
38 52
39 68
40 54
41 81
42 36
43 33
44 99
45 61
46 38
47 99
48 77
49 51
50 76
51 88
52 63
53 67
54 92
55 88
56 140
57 40
58 12
59 153
60 90
61 71
62 98
63 121
64 98
65 104
66 100
67 41

List of values

[0, 0, 0, 1, 2, 3, 4, 3, 9, 9, 4, 17, 11, 7, 18, 16, 19, 21, 16, 21, 35, 24, 8, 35, 42, 17, 44, 40, 25, 47, 28, 47, 56, 28, 30, 76, 69, 11, 52, 68, 54, 81, 36, 33, 99, 61, 38, 99, 77, 51, 76, 88, 63, 67, 92, 88, 140, 40, 12, 153, 90, 71, 98, 121, 98, 104, 100, 41]

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

Content is available under The OEIS End-User License Agreement.