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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.

A025556 a(n) = sum of the exponents in the prime factorization of LCM{1,3,6,...,C(n+1,2)}.

Table of values

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

List of values

[0, 1, 2, 3, 3, 4, 5, 6, 6, 7, 7, 8, 8, 8, 9, 10, 10, 11, 11, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 17, 17, 17, 17, 17, 18, 18, 18, 18, 19, 19, 20, 20, 20, 20, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23, 23, 23, 24, 24, 25, 25, 25, 26, 26, 26, 27, 27, 27, 27, 28, 28, 29, 29, 29, 29, 29, 29, 30]

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

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