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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.

A124741 a(n) = largest of those positive integers which are coprime to both n and n+1 and which are <= n.

Table of values

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

List of values

[1, 1, 1, 3, 1, 5, 5, 7, 7, 9, 7, 11, 11, 13, 13, 15, 13, 17, 17, 19, 19, 21, 19, 23, 23, 25, 25, 27, 23, 29, 29, 31, 31, 33, 31, 35, 35, 37, 37, 39, 37, 41, 41, 43, 43, 45, 43, 47, 47, 49, 49, 51, 49, 53, 53, 55, 55, 57, 53, 59, 59, 61, 61, 63, 61, 65, 65, 67, 67, 69, 67, 71, 71]

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

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