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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.

A179650 a(n) = (n-th prime) mod (n-th nonprime).

Table of values

n a(n)
1 0
2 3
3 5
4 7
5 2
6 3
7 5
8 5
9 8
10 13
11 13
12 17
13 20
14 21
15 23
16 3
17 7
18 7
19 11
20 11
21 9
22 13
23 15
24 19
25 25
26 25
27 25
28 27
29 25
30 25
31 37
32 39
33 41
34 41
35 49
36 49
37 1
38 1
39 2
40 5
41 8
42 7
43 11
44 7
45 8
46 7
47 16
48 25
49 23
50 22
51 23
52 23
53 19
54 26
55 29
56 32
57 35
58 31
59 34
60 35
61 31
62 38
63 49
64 50
65 49
66 47
67 58
68 61
69 68
70 67
71 68
72 71
73 73
74 76
75 79
76 77
77 77

List of values

[0, 3, 5, 7, 2, 3, 5, 5, 8, 13, 13, 17, 20, 21, 23, 3, 7, 7, 11, 11, 9, 13, 15, 19, 25, 25, 25, 27, 25, 25, 37, 39, 41, 41, 49, 49, 1, 1, 2, 5, 8, 7, 11, 7, 8, 7, 16, 25, 23, 22, 23, 23, 19, 26, 29, 32, 35, 31, 34, 35, 31, 38, 49, 50, 49, 47, 58, 61, 68, 67, 68, 71, 73, 76, 79, 77, 77]

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

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