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.

A127570 Triangle T(n,k) = sigma(k) if k|n, otherwise T(n,k)=0; 1 <= k <= n.

Table of values

n a(n)
1 1
2 1
3 3
4 1
5 0
6 4
7 1
8 3
9 0
10 7
11 1
12 0
13 0
14 0
15 6
16 1
17 3
18 4
19 0
20 0
21 12
22 1
23 0
24 0
25 0
26 0
27 0
28 8
29 1
30 3
31 0
32 7
33 0
34 0
35 0
36 15
37 1
38 0
39 4
40 0
41 0
42 0
43 0
44 0
45 13
46 1
47 3
48 0
49 0
50 6
51 0
52 0
53 0
54 0
55 18
56 1
57 0
58 0
59 0
60 0
61 0
62 0
63 0
64 0
65 0
66 12
67 1
68 3
69 4
70 7
71 0
72 12
73 0
74 0
75 0
76 0
77 0
78 28
79 1

List of values

[1, 1, 3, 1, 0, 4, 1, 3, 0, 7, 1, 0, 0, 0, 6, 1, 3, 4, 0, 0, 12, 1, 0, 0, 0, 0, 0, 8, 1, 3, 0, 7, 0, 0, 0, 15, 1, 0, 4, 0, 0, 0, 0, 0, 13, 1, 3, 0, 0, 6, 0, 0, 0, 0, 18, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 1, 3, 4, 7, 0, 12, 0, 0, 0, 0, 0, 28, 1]

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

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