A330719 - cp's OEIS frontend

A330719 a(n) = denominator(Sum_{k=1..n} (2^(k-1) - 1)/k).

n	a(n)
1	1
2	2
3	2
4	4
5	4
6	12
7	12
8	24
9	8
10	40
11	40
12	120
13	120
14	840
15	840
16	1680
17	1680
18	5040
19	5040
20	5040
21	5040
22	55440
23	55440
24	55440
25	11088
26	144144
27	48048
28	48048
29	48048
30	80080
31	80080
32	160160
33	160160
34	2722720
35	544544
36	4900896
37	4900896
38	93117024
39	93117024
40	465585120
41	465585120
42	465585120

[1, 2, 2, 4, 4, 12, 12, 24, 8, 40, 40, 120, 120, 840, 840, 1680, 1680, 5040, 5040, 5040, 5040, 55440, 55440, 55440, 11088, 144144, 48048, 48048, 48048, 80080, 80080, 160160, 160160, 2722720, 544544, 4900896, 4900896, 93117024, 93117024, 465585120, 465585120, 465585120]

cp's OEIS Frontend

A330719 a(n) = denominator(Sum_{k=1..n} (2^(k-1) - 1)/k).

Table of values

List of values