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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.

A139421 a(1)=1; for n>1, a(n) = largest prime divisor of n!!.

Table of values

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

List of values

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

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