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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.

A137927 a(n) = the largest divisor of A000005(n) that is coprime to n. (A000005(n) = the number of positive divisors of n.).

Table of values

n a(n)
1 1
2 1
3 2
4 3
5 2
6 1
7 2
8 1
9 1
10 1
11 2
12 1
13 2
14 1
15 4
16 5
17 2
18 1
19 2
20 3
21 4
22 1
23 2
24 1
25 3
26 1
27 4
28 3
29 2
30 1
31 2
32 3
33 4
34 1
35 4
36 1
37 2
38 1
39 4
40 1
41 2
42 1
43 2
44 3
45 2
46 1
47 2
48 5
49 3
50 3
51 4
52 3
53 2
54 1
55 4
56 1
57 4
58 1
59 2
60 1
61 2
62 1
63 2
64 7
65 4
66 1
67 2
68 3
69 4
70 1
71 2
72 1
73 2
74 1
75 2
76 3
77 4
78 1
79 2
80 1

List of values

[1, 1, 2, 3, 2, 1, 2, 1, 1, 1, 2, 1, 2, 1, 4, 5, 2, 1, 2, 3, 4, 1, 2, 1, 3, 1, 4, 3, 2, 1, 2, 3, 4, 1, 4, 1, 2, 1, 4, 1, 2, 1, 2, 3, 2, 1, 2, 5, 3, 3, 4, 3, 2, 1, 4, 1, 4, 1, 2, 1, 2, 1, 2, 7, 4, 1, 2, 3, 4, 1, 2, 1, 2, 1, 2, 3, 4, 1, 2, 1]

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

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