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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.

A055768 Number of distinct primes dividing phi of n-th primorial number.

Table of values

n a(n)
1 0
2 1
3 1
4 2
5 3
6 3
7 3
8 3
9 4
10 5
11 5
12 5
13 5
14 5
15 6
16 7
17 8
18 8
19 8
20 8
21 8
22 8
23 9
24 9
25 9
26 9
27 10
28 11
29 11
30 11
31 11
32 11
33 11
34 11
35 12
36 12
37 12
38 12
39 13
40 14
41 15
42 15
43 16
44 16
45 16
46 16
47 16
48 16
49 17
50 17
51 17
52 17
53 17
54 17
55 17
56 18
57 19
58 19
59 19
60 19
61 20
62 21
63 21
64 22
65 22
66 23
67 23
68 23
69 24
70 24
71 24
72 25
73 26
74 26
75 26
76 27
77 28
78 28

List of values

[0, 1, 1, 2, 3, 3, 3, 3, 4, 5, 5, 5, 5, 5, 6, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 10, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 13, 14, 15, 15, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 17, 18, 19, 19, 19, 19, 20, 21, 21, 22, 22, 23, 23, 23, 24, 24, 24, 25, 26, 26, 26, 27, 28, 28]

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

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