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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.

A370689 Numerator of sigma(phi(n))/phi(sigma(n)), where sigma is the sum of the divisors function and phi is the Euler totient function.

Table of values

n a(n)
1 1
2 1
3 3
4 1
5 7
6 3
7 3
8 7
9 1
10 7
11 9
12 7
13 14
14 3
15 15
16 1
17 31
18 1
19 39
20 5
21 7
22 3
23 9
24 15
25 7
26 7
27 39
28 7
29 7
30 5
31 9
32 31
33 21
34 31
35 15
36 7
37 91
38 39
39 5
40 31
41 15
42 7
43 24
44 7
45 5
46 3
47 9
48 31
49 8
50 7
51 21
52 10
53 49
54 39
55 15
56 15
57 91
58 7
59 45
60 31
61 28
62 9
63 91
64 1
65 31
66 7
67 9
68 7
69 21
70 5
71 6
72 5
73 65
74 91
75 3
76 91
77 21

List of values

[1, 1, 3, 1, 7, 3, 3, 7, 1, 7, 9, 7, 14, 3, 15, 1, 31, 1, 39, 5, 7, 3, 9, 15, 7, 7, 39, 7, 7, 5, 9, 31, 21, 31, 15, 7, 91, 39, 5, 31, 15, 7, 24, 7, 5, 3, 9, 31, 8, 7, 21, 10, 49, 39, 15, 15, 91, 7, 45, 31, 28, 9, 91, 1, 31, 7, 9, 7, 21, 5, 6, 5, 65, 91, 3, 91, 21]

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

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