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.

A138881 Array read by rows: row n lists divisors of n-th positive triangular number A000217(n).

Table of values

n a(n)
1 1
2 1
3 3
4 1
5 2
6 3
7 6
8 1
9 2
10 5
11 10
12 1
13 3
14 5
15 15
16 1
17 3
18 7
19 21
20 1
21 2
22 4
23 7
24 14
25 28
26 1
27 2
28 3
29 4
30 6
31 9
32 12
33 18
34 36
35 1
36 3
37 5
38 9
39 15
40 45
41 1
42 5
43 11
44 55
45 1
46 2
47 3
48 6
49 11
50 22
51 33
52 66
53 1
54 2
55 3
56 6
57 13
58 26
59 39
60 78
61 1
62 7
63 13
64 91
65 1
66 3
67 5
68 7
69 15
70 21
71 35
72 105

List of values

[1, 1, 3, 1, 2, 3, 6, 1, 2, 5, 10, 1, 3, 5, 15, 1, 3, 7, 21, 1, 2, 4, 7, 14, 28, 1, 2, 3, 4, 6, 9, 12, 18, 36, 1, 3, 5, 9, 15, 45, 1, 5, 11, 55, 1, 2, 3, 6, 11, 22, 33, 66, 1, 2, 3, 6, 13, 26, 39, 78, 1, 7, 13, 91, 1, 3, 5, 7, 15, 21, 35, 105]

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

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