A365228 - cp's OEIS frontend

A365228 Denominator of Sum_{1<=j<=k<=n, gcd(j,k)=1} 1/(j*k).

n	a(n)
1	1
2	2
3	1
4	3
5	4
6	20
7	10
8	210
9	168
10	504
11	105
12	1155
13	792
14	1560
15	60060
16	180180
17	16016
18	123760
19	510510
20	29099070
21	21162960
22	335920
23	3233230
24	74364290
25	45762640
26	187210800
27	13385572200
28	40156716600
29	97349616
30	31054527504
31	166363540200
32	12033629407800
33	2831442213600
34	1698865328160

[1, 2, 1, 3, 4, 20, 10, 210, 168, 504, 105, 1155, 792, 1560, 60060, 180180, 16016, 123760, 510510, 29099070, 21162960, 335920, 3233230, 74364290, 45762640, 187210800, 13385572200, 40156716600, 97349616, 31054527504, 166363540200, 12033629407800, 2831442213600, 1698865328160]

cp's OEIS Frontend

A365228 Denominator of Sum_{1<=j<=k<=n, gcd(j,k)=1} 1/(j*k).

Table of values

List of values