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.

A366444 Triangle read by rows: T(n,k) = phi(n/k)*A023900(k) if k divides n, T(n,k) = 0 otherwise (n >= 1, 1 <= k <= n).

Table of values

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

List of values

[1, 1, -1, 2, 0, -2, 2, -1, 0, -1, 4, 0, 0, 0, -4, 2, -2, -2, 0, 0, 2, 6, 0, 0, 0, 0, 0, -6, 4, -2, 0, -1, 0, 0, 0, -1, 6, 0, -4, 0, 0, 0, 0, 0, -2, 4, -4, 0, 0, -4, 0, 0, 0, 0, 4, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, -10, 4, -2, -4, -2, 0, 2, 0, 0, 0, 0, 0, 2]

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

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