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.

A167493 a(1) = 2; thereafter a(n) = a(n-1) + gcd(n, a(n-1)) if n is odd, and a(n) = a(n-1) + gcd(n-2, a(n-1)) if n is even.

Table of values

n a(n)
1 2
2 4
3 5
4 6
5 7
6 8
7 9
8 12
9 15
10 16
11 17
12 18
13 19
14 20
15 25
16 26
17 27
18 28
19 29
20 30
21 33
22 34
23 35
24 36
25 37
26 38
27 39
28 52
29 53
30 54
31 55
32 60
33 63
34 64
35 65
36 66
37 67
38 68
39 69
40 70
41 71
42 72
43 73
44 74
45 75
46 76
47 77
48 78
49 79
50 80
51 81
52 82
53 83
54 84
55 85
56 86
57 87
58 88
59 89
60 90
61 91
62 92
63 93
64 124
65 125
66 126

List of values

[2, 4, 5, 6, 7, 8, 9, 12, 15, 16, 17, 18, 19, 20, 25, 26, 27, 28, 29, 30, 33, 34, 35, 36, 37, 38, 39, 52, 53, 54, 55, 60, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 124, 125, 126]

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

Content is available under The OEIS End-User License Agreement.