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.

A366362 Triangle read by rows: T(n,k) = Sum_{y=1..n} Sum_{x=1..n} [GCD(f(x,y), n) = k], where f(x,y) = x^3 - x^2 - y^2 - y.

Table of values

n a(n)
1 1
2 0
3 4
4 5
5 0
6 4
7 0
8 8
9 0
10 8
11 21
12 0
13 0
14 0
15 4
16 0
17 20
18 0
19 0
20 0
21 16
22 40
23 0
24 0
25 0
26 0
27 0
28 9
29 0
30 32
31 0
32 16
33 0
34 0
35 0
36 16
37 45
38 0
39 24
40 0
41 0
42 0
43 0
44 0
45 12
46 0
47 84
48 0
49 0
50 0
51 0
52 0
53 0
54 0
55 16
56 111
57 0
58 0
59 0
60 0
61 0
62 0
63 0
64 0
65 0
66 10
67 0
68 40
69 0
70 40
71 0
72 32
73 0
74 0
75 0
76 0
77 0
78 32

List of values

[1, 0, 4, 5, 0, 4, 0, 8, 0, 8, 21, 0, 0, 0, 4, 0, 20, 0, 0, 0, 16, 40, 0, 0, 0, 0, 0, 9, 0, 32, 0, 16, 0, 0, 0, 16, 45, 0, 24, 0, 0, 0, 0, 0, 12, 0, 84, 0, 0, 0, 0, 0, 0, 0, 16, 111, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 0, 40, 0, 40, 0, 32, 0, 0, 0, 0, 0, 32]

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

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