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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.

A119905 Numbers k such that gcd(k, R_k) = 1, where R_k is the repunit (10^k -1)/9 = A002275(k).

Table of values

n a(n)
1 1
2 2
3 4
4 5
5 7
6 8
7 10
8 11
9 13
10 14
11 16
12 17
13 19
14 20
15 23
16 25
17 26
18 28
19 29
20 31
21 32
22 34
23 35
24 37
25 38
26 40
27 41
28 43
29 46
30 47
31 49
32 50
33 52
34 53
35 55
36 56
37 58
38 59
39 61
40 62
41 64
42 65
43 67
44 68
45 70
46 71
47 73
48 74
49 76
50 77
51 79
52 80
53 82
54 83
55 85
56 86
57 89
58 91
59 92
60 94
61 95
62 97
63 98
64 100
65 101
66 103
67 104
68 106
69 107

List of values

[1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, 19, 20, 23, 25, 26, 28, 29, 31, 32, 34, 35, 37, 38, 40, 41, 43, 46, 47, 49, 50, 52, 53, 55, 56, 58, 59, 61, 62, 64, 65, 67, 68, 70, 71, 73, 74, 76, 77, 79, 80, 82, 83, 85, 86, 89, 91, 92, 94, 95, 97, 98, 100, 101, 103, 104, 106, 107]

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

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