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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.

A025561 a(n) = sum of the exponents in the prime factorization of LCM{1, n-1, ..., C(n-[ n/2 ],[ n/2 ])}.

Table of values

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

List of values

[0, 0, 1, 1, 3, 3, 4, 4, 6, 6, 7, 7, 8, 8, 9, 8, 10, 10, 11, 11, 12, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16, 18, 17, 18, 17, 18, 18, 19, 18, 19, 19, 20, 20, 21, 20, 21, 21, 22, 22, 23, 22, 23, 23, 24, 23, 24, 23, 24, 24, 25, 25, 26, 25, 27, 26, 27, 27, 28, 27, 28, 28, 29, 29, 30]

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

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