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.

A072028 Swap twin prime pairs of form (4*k+1,4*k+3) in prime factorization of n.

Table of values

n a(n)
1 1
2 2
3 3
4 4
5 7
6 6
7 5
8 8
9 9
10 14
11 11
12 12
13 13
14 10
15 21
16 16
17 19
18 18
19 17
20 28
21 15
22 22
23 23
24 24
25 49
26 26
27 27
28 20
29 31
30 42
31 29
32 32
33 33
34 38
35 35
36 36
37 37
38 34
39 39
40 56
41 43
42 30
43 41
44 44
45 63
46 46
47 47
48 48
49 25
50 98
51 57
52 52
53 53
54 54
55 77
56 40
57 51
58 62
59 59
60 84
61 61
62 58
63 45
64 64
65 91
66 66

List of values

[1, 2, 3, 4, 7, 6, 5, 8, 9, 14, 11, 12, 13, 10, 21, 16, 19, 18, 17, 28, 15, 22, 23, 24, 49, 26, 27, 20, 31, 42, 29, 32, 33, 38, 35, 36, 37, 34, 39, 56, 43, 30, 41, 44, 63, 46, 47, 48, 25, 98, 57, 52, 53, 54, 77, 40, 51, 62, 59, 84, 61, 58, 45, 64, 91, 66]

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

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