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.

A257340 Arrange numbers in a single clockwise spiral so that each number is relatively prime to its four (N,S,E,W) neighbors.

Table of values

n a(n)
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10
11 11
12 13
13 12
14 17
15 15
16 14
17 19
18 16
19 23
20 18
21 25
22 22
23 21
24 20
25 27
26 26
27 29
28 24
29 31
30 35
31 32
32 37
33 28
34 41
35 33
36 34
37 39
38 40
39 43
40 30
41 47
42 36
43 49
44 38
45 45
46 44
47 51
48 46
49 53
50 42
51 55
52 48
53 59
54 50
55 57
56 61
57 52
58 63
59 58
60 65
61 54
62 67
63 69
64 56
65 71
66 62
67 73

List of values

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 12, 17, 15, 14, 19, 16, 23, 18, 25, 22, 21, 20, 27, 26, 29, 24, 31, 35, 32, 37, 28, 41, 33, 34, 39, 40, 43, 30, 47, 36, 49, 38, 45, 44, 51, 46, 53, 42, 55, 48, 59, 50, 57, 61, 52, 63, 58, 65, 54, 67, 69, 56, 71, 62, 73]

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

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