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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.

A004788 Number of distinct prime divisors of the numbers in row n of Pascal's triangle.

Table of values

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

List of values

[0, 0, 1, 1, 2, 2, 3, 3, 3, 3, 4, 5, 5, 5, 5, 5, 6, 6, 7, 7, 7, 7, 8, 9, 8, 8, 8, 8, 9, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 13, 13, 14, 13, 14, 15, 14, 14, 14, 14, 15, 15, 15, 16, 15, 15, 16, 17, 17, 17, 18, 17, 17, 17, 18, 18, 18, 19, 19, 20, 20]

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

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