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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.

A383213 a(n) = number of distinct prime factors of binomial(2n,n+1).

Table of values

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

List of values

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

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

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