A371878 - cp's OEIS frontend

A371878 a(n) = Sum_{1 <= x_1, x_2, x_3, x_4, x_5 <= n} n/gcd(x_1, x_2, x_3, x_4, x_5, n).

n	a(n)
1	1
2	63
3	727
4	4031
5	15621
6	45801
7	117643
8	257983
9	529981
10	984123
11	1771551
12	2930537
13	4826797
14	7411509
15	11356467
16	16510911
17	24137553
18	33388803
19	47045863
20	62968251
21	85526461
22	111607713
23	148035867
24	187553641
25	244078121
26	304088211
27	386356147
28	474218933
29	594823293
30	715457421

[1, 63, 727, 4031, 15621, 45801, 117643, 257983, 529981, 984123, 1771551, 2930537, 4826797, 7411509, 11356467, 16510911, 24137553, 33388803, 47045863, 62968251, 85526461, 111607713, 148035867, 187553641, 244078121, 304088211, 386356147, 474218933, 594823293, 715457421]

cp's OEIS Frontend

A371878 a(n) = Sum_{1 <= x_1, x_2, x_3, x_4, x_5 <= n} n/gcd(x_1, x_2, x_3, x_4, x_5, n).

Table of values

List of values