cp's OEIS Frontend

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.

A072454 Number of nontotients in the reduced residue system of 2n-1.

Table of values

n a(n)
1 0
2 0
3 1
4 2
5 2
6 4
7 5
8 4
9 8
10 9
11 5
12 11
13 10
14 10
15 15
16 16
17 11
18 13
19 20
20 14
21 23
22 24
23 15
24 26
25 23
26 19
27 30
28 23
29 21
30 33
31 34
32 22
33 27
34 38
35 28
36 41
37 42
38 26
39 37
40 47
41 35
42 49
43 37
44 37
45 53
46 44
47 38
48 43
49 59
50 41
51 62
52 63
53 32
54 65
55 66
56 46
57 68
58 55
59 46
60 58
61 69
62 53
63 64
64 79
65 55
66 81
67 65
68 50
69 85
70 86
71 60
72 77
73 72

List of values

[0, 0, 1, 2, 2, 4, 5, 4, 8, 9, 5, 11, 10, 10, 15, 16, 11, 13, 20, 14, 23, 24, 15, 26, 23, 19, 30, 23, 21, 33, 34, 22, 27, 38, 28, 41, 42, 26, 37, 47, 35, 49, 37, 37, 53, 44, 38, 43, 59, 41, 62, 63, 32, 65, 66, 46, 68, 55, 46, 58, 69, 53, 64, 79, 55, 81, 65, 50, 85, 86, 60, 77, 72]

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

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