A128438 - cp's OEIS frontend

A128438 a(n) = floor((denominator of H(n))/n), where H(n) = Sum_{k=1..n} 1/k, the n-th harmonic number.

n	a(n)
1	1
2	1
3	2
4	3
5	12
6	3
7	20
8	35
9	280
10	252
11	2520
12	2310
13	27720
14	25740
15	24024
16	45045
17	720720
18	226893
19	4084080
20	775975
21	246341
22	235144
23	5173168
24	14872858
25	356948592
26	343219800
27	2974571600
28	2868336900
29	80313433200
30	77636318760
31	2329089562800

[1, 1, 2, 3, 12, 3, 20, 35, 280, 252, 2520, 2310, 27720, 25740, 24024, 45045, 720720, 226893, 4084080, 775975, 246341, 235144, 5173168, 14872858, 356948592, 343219800, 2974571600, 2868336900, 80313433200, 77636318760, 2329089562800]

cp's OEIS Frontend

A128438 a(n) = floor((denominator of H(n))/n), where H(n) = Sum_{k=1..n} 1/k, the n-th harmonic number.

Table of values

List of values