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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.

A078773 a(n) is the largest prime less than or equal to phi(n), a(1) = a(2) = 0.

Table of values

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

List of values

[0, 0, 2, 2, 3, 2, 5, 3, 5, 3, 7, 3, 11, 5, 7, 7, 13, 5, 17, 7, 11, 7, 19, 7, 19, 11, 17, 11, 23, 7, 29, 13, 19, 13, 23, 11, 31, 17, 23, 13, 37, 11, 41, 19, 23, 19, 43, 13, 41, 19, 31, 23, 47, 17, 37, 23, 31, 23, 53, 13, 59, 29, 31, 31, 47, 19, 61, 31, 43, 23, 67, 23, 71, 31, 37, 31]

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