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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.

A089912 a(n) gives sum of number of common unitary divisors of n and m, where m runs from 1 to n.

Table of values

n a(n)
1 1
2 3
3 4
4 5
5 6
6 11
7 8
8 9
9 10
10 16
11 12
12 18
13 14
14 21
15 23
16 17
17 18
18 26
19 20
20 28
21 30
22 31
23 24
24 33
25 26
26 36
27 28
28 37
29 30
30 57
31 32
32 33
33 45
34 46
35 47
36 45
37 38
38 51
39 52
40 51
41 42
42 77
43 44
44 55
45 58
46 61
47 48
48 62
49 50
50 66
51 67
52 64
53 54
54 71
55 70
56 68
57 74
58 76
59 60
60 100
61 62
62 81
63 77
64 65
65 82
66 113
67 68
68 82
69 89
70 118
71 72

List of values

[1, 3, 4, 5, 6, 11, 8, 9, 10, 16, 12, 18, 14, 21, 23, 17, 18, 26, 20, 28, 30, 31, 24, 33, 26, 36, 28, 37, 30, 57, 32, 33, 45, 46, 47, 45, 38, 51, 52, 51, 42, 77, 44, 55, 58, 61, 48, 62, 50, 66, 67, 64, 54, 71, 70, 68, 74, 76, 60, 100, 62, 81, 77, 65, 82, 113, 68, 82, 89, 118, 72]

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

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