A128647 - cp's OEIS frontend

A128647 a(n) = numerator(Sum_{k=1..n} (-1)^(k+1)/(prime(k)-1)).

n	a(n)
1	1
2	1
3	3
4	7
5	41
6	3
7	53
8	437
9	5167
10	34189
11	36037
12	3833
13	3987
14	11521
15	274223
16	3458639
17	103063291
18	100392623
19	34273501
20	33510453
21	308270747
22	302107667
23	12626774467
24	12402802537
25	25216220279
26	124110148411
27	2142721739387
28	111888942151111

[1, 1, 3, 7, 41, 3, 53, 437, 5167, 34189, 36037, 3833, 3987, 11521, 274223, 3458639, 103063291, 100392623, 34273501, 33510453, 308270747, 302107667, 12626774467, 12402802537, 25216220279, 124110148411, 2142721739387, 111888942151111]

cp's OEIS Frontend

A128647 a(n) = numerator(Sum_{k=1..n} (-1)^(k+1)/(prime(k)-1)).

Table of values

List of values