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.

A247225 a(n) = n if n <= 3, a(4)=5, otherwise the smallest number not occurring earlier having at least one common factor with a(n-3), but none with a(n-1)*a(n-2).

Table of values

n a(n)
1 1
2 2
3 3
4 5
5 4
6 9
7 25
8 8
9 21
10 55
11 16
12 7
13 11
14 6
15 35
16 121
17 12
18 49
19 143
20 10
21 63
22 13
23 20
24 27
25 91
26 22
27 15
28 119
29 26
30 33
31 17
32 14
33 39
34 85
35 28
36 57
37 65
38 32
39 19
40 45
41 34
42 133
43 69
44 40
45 77
46 23
47 18
48 175
49 253
50 24
51 95
52 161
53 36
54 125
55 203
56 38
57 75
58 29
59 44
60 51
61 145
62 46
63 81
64 155
65 52

List of values

[1, 2, 3, 5, 4, 9, 25, 8, 21, 55, 16, 7, 11, 6, 35, 121, 12, 49, 143, 10, 63, 13, 20, 27, 91, 22, 15, 119, 26, 33, 17, 14, 39, 85, 28, 57, 65, 32, 19, 45, 34, 133, 69, 40, 77, 23, 18, 175, 253, 24, 95, 161, 36, 125, 203, 38, 75, 29, 44, 51, 145, 46, 81, 155, 52]

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

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