A128646 - cp's OEIS frontend

A128646 a(n) = denominator(Sum_{k=1..n} 1/(prime(k)-1)).

n	a(n)
1	1
2	2
3	4
4	12
5	60
6	10
7	80
8	720
9	7920
10	55440
11	55440
12	18480
13	18480
14	18480
15	425040
16	5525520
17	160240080
18	53413360
19	160240080
20	160240080
21	480720240
22	480720240
23	19709529840
24	19709529840
25	39419059680
26	197095298400
27	3350620072800

[1, 2, 4, 12, 60, 10, 80, 720, 7920, 55440, 55440, 18480, 18480, 18480, 425040, 5525520, 160240080, 53413360, 160240080, 160240080, 480720240, 480720240, 19709529840, 19709529840, 39419059680, 197095298400, 3350620072800]

cp's OEIS Frontend

A128646 a(n) = denominator(Sum_{k=1..n} 1/(prime(k)-1)).

Table of values

List of values