A372969 - cp's OEIS frontend

A372969 a(n) = Sum_{1 <= x_1, x_2, ... , x_n <= n} n/gcd(x_1, x_2, ... , x_n, n).

n	a(n)
1	1
2	7
3	79
4	991
5	15621
6	277495
7	5764795
8	133955071
9	3486666301
10	99951163687
11	3138428376711
12	106980008889391
13	3937376385699277
14	155563347996105679
15	6568408050364922499
16	295145653362359140351
17	14063084452067724990993
18	708233993284902846818911

[1, 7, 79, 991, 15621, 277495, 5764795, 133955071, 3486666301, 99951163687, 3138428376711, 106980008889391, 3937376385699277, 155563347996105679, 6568408050364922499, 295145653362359140351, 14063084452067724990993, 708233993284902846818911]

cp's OEIS Frontend

A372969 a(n) = Sum_{1 <= x_1, x_2, ... , x_n <= n} n/gcd(x_1, x_2, ... , x_n, n).

Table of values

List of values