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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.

A072027 Swap (2,3) and all twin prime pairs >(3,5) in prime factorization of n.

Table of values

n a(n)
1 1
2 3
3 2
4 9
5 7
6 6
7 5
8 27
9 4
10 21
11 13
12 18
13 11
14 15
15 14
16 81
17 19
18 12
19 17
20 63
21 10
22 39
23 23
24 54
25 49
26 33
27 8
28 45
29 31
30 42
31 29
32 243
33 26
34 57
35 35
36 36
37 37
38 51
39 22
40 189
41 43
42 30
43 41
44 117
45 28
46 69
47 47
48 162
49 25
50 147
51 38
52 99
53 53
54 24
55 91
56 135
57 34
58 93
59 61
60 126
61 59
62 87
63 20
64 729
65 77

List of values

[1, 3, 2, 9, 7, 6, 5, 27, 4, 21, 13, 18, 11, 15, 14, 81, 19, 12, 17, 63, 10, 39, 23, 54, 49, 33, 8, 45, 31, 42, 29, 243, 26, 57, 35, 36, 37, 51, 22, 189, 43, 30, 41, 117, 28, 69, 47, 162, 25, 147, 38, 99, 53, 24, 91, 135, 34, 93, 61, 126, 59, 87, 20, 729, 77]

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

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