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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.

A328661 If n is the k-th composite number then a(n) = a(k), otherwise a(n) = n.

Table of values

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

List of values

[1, 2, 3, 1, 5, 2, 7, 3, 1, 5, 11, 2, 13, 7, 3, 1, 17, 5, 19, 11, 2, 13, 23, 7, 3, 1, 17, 5, 29, 19, 31, 11, 2, 13, 23, 7, 37, 3, 1, 17, 41, 5, 43, 29, 19, 31, 47, 11, 2, 13, 23, 7, 53, 37, 3, 1, 17, 41, 59, 5, 61, 43, 29, 19, 31, 47, 67, 11, 2, 13, 71, 23, 73]

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

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