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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.

A321580 Numbers k such that it is possible to reverse a deck of k cards by a sequence of perfect Faro shuffles with cut.

Table of values

n a(n)
1 1
2 2
3 4
4 8
5 10
6 12
7 16
8 18
9 24
10 26
11 28
12 32
13 36
14 40
15 42
16 52
17 56
18 58
19 60
20 64
21 66
22 80
23 82
24 96
25 98
26 100
27 106
28 108
29 112
30 120
31 124
32 128
33 130
34 136
35 138
36 144
37 148
38 156
39 162
40 168
41 170
42 172
43 176
44 178
45 180
46 184
47 192
48 196
49 200
50 204
51 208
52 210
53 226
54 228
55 240
56 242
57 248
58 250

List of values

[1, 2, 4, 8, 10, 12, 16, 18, 24, 26, 28, 32, 36, 40, 42, 52, 56, 58, 60, 64, 66, 80, 82, 96, 98, 100, 106, 108, 112, 120, 124, 128, 130, 136, 138, 144, 148, 156, 162, 168, 170, 172, 176, 178, 180, 184, 192, 196, 200, 204, 208, 210, 226, 228, 240, 242, 248, 250]

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

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