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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.

A072010 In prime factorization of n replace all primes of form k*4+1 with k*4+3 and primes of form k*4+3 with k*4+1.

Table of values

n a(n)
1 1
2 2
3 1
4 4
5 7
6 2
7 5
8 8
9 1
10 14
11 9
12 4
13 15
14 10
15 7
16 16
17 19
18 2
19 17
20 28
21 5
22 18
23 21
24 8
25 49
26 30
27 1
28 20
29 31
30 14
31 29
32 32
33 9
34 38
35 35
36 4
37 39
38 34
39 15
40 56
41 43
42 10
43 41
44 36
45 7
46 42
47 45
48 16
49 25
50 98
51 19
52 60
53 55
54 2
55 63
56 40
57 17
58 62
59 57
60 28
61 63
62 58
63 5
64 64
65 105
66 18
67 65
68 76
69 21
70 70
71 69

List of values

[1, 2, 1, 4, 7, 2, 5, 8, 1, 14, 9, 4, 15, 10, 7, 16, 19, 2, 17, 28, 5, 18, 21, 8, 49, 30, 1, 20, 31, 14, 29, 32, 9, 38, 35, 4, 39, 34, 15, 56, 43, 10, 41, 36, 7, 42, 45, 16, 25, 98, 19, 60, 55, 2, 63, 40, 17, 62, 57, 28, 63, 58, 5, 64, 105, 18, 65, 76, 21, 70, 69]