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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.

A055930 Number of distinct prime factors of totient of (n-th prime)!.

Table of values

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

List of values

[0, 1, 1, 2, 3, 3, 4, 4, 5, 6, 6, 7, 8, 8, 9, 9, 10, 10, 11, 11, 11, 12, 13, 14, 15, 15, 15, 16, 16, 16, 18, 18, 19, 19, 21, 21, 21, 22, 23, 23, 24, 24, 24, 24, 25, 25, 27, 29, 30, 30, 30, 30, 30, 30, 31, 32, 32, 32, 33, 34, 34, 34, 36, 36, 36, 37, 38, 39, 40, 40, 40, 41, 42, 42]

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

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