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.

A265401 Numbers n for which gcd{k=1..n-1} binomial(2*n, 2*k) = 1.

Table of values

n a(n)
1 20
2 26
3 33
4 35
5 38
6 39
7 44
8 46
9 48
10 50
11 56
12 58
13 60
14 62
15 68
16 72
17 74
18 77
19 78
20 80
21 86
22 88
23 92
24 93
25 94
26 95
27 98
28 102
29 104
30 105
31 108
32 110
33 111
34 116
35 118
36 119
37 124
38 130
39 133
40 134
41 138
42 140
43 143
44 144
45 146
46 148
47 150
48 152
49 155
50 158
51 160
52 161
53 164
54 165
55 168
56 170
57 171
58 176
59 178
60 182
61 183
62 185
63 186
64 188
65 189
66 194
67 198
68 200

List of values

[20, 26, 33, 35, 38, 39, 44, 46, 48, 50, 56, 58, 60, 62, 68, 72, 74, 77, 78, 80, 86, 88, 92, 93, 94, 95, 98, 102, 104, 105, 108, 110, 111, 116, 118, 119, 124, 130, 133, 134, 138, 140, 143, 144, 146, 148, 150, 152, 155, 158, 160, 161, 164, 165, 168, 170, 171, 176, 178, 182, 183, 185, 186, 188, 189, 194, 198, 200]