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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.

A137926 a(n) = the largest divisor of n that is coprime to A000005(n). (A000005(n) = the number of positive divisors of n.)

Table of values

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

List of values

[1, 1, 3, 4, 5, 3, 7, 1, 1, 5, 11, 1, 13, 7, 15, 16, 17, 1, 19, 5, 21, 11, 23, 3, 25, 13, 27, 7, 29, 15, 31, 1, 33, 17, 35, 4, 37, 19, 39, 5, 41, 21, 43, 11, 5, 23, 47, 3, 49, 25, 51, 13, 53, 27, 55, 7, 57, 29, 59, 5, 61, 31, 7, 64, 65, 33, 67, 17, 69, 35, 71, 1, 73, 37, 25, 19, 77, 39, 79]

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

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