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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.

A294269 a(n) is the smallest number not already in the sequence which shares a factor with an even number of preceding terms; a(1) = 1.

Table of values

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

List of values

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

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

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