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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.

A327637 a(n) is the number of integers j such that 1 <= j <= n and gcd(n,j) is a triangular number.

Table of values

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

List of values

[1, 1, 3, 2, 4, 4, 6, 4, 8, 5, 10, 7, 12, 6, 13, 8, 16, 10, 18, 9, 19, 10, 22, 14, 20, 12, 24, 13, 28, 19, 30, 16, 30, 16, 24, 19, 36, 18, 36, 18, 40, 25, 42, 20, 35, 22, 46, 28, 42, 24, 48, 24, 52, 30, 41, 25, 54, 28, 58, 32, 60, 30, 50, 32, 48, 41, 66, 32, 66, 30, 70, 37, 72, 36, 64]

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

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