A372961 - cp's OEIS frontend

A372961 a(n) = Sum_{1 <= x_1, x_2, x_3, x_4 <= n} n/gcd(x_1, x_2, x_3, x_4, n).

n	a(n)
1	1
2	31
3	241
4	991
5	3121
6	7471
7	16801
8	31711
9	58561
10	96751
11	161041
12	238831
13	371281
14	520831
15	752161
16	1014751
17	1419841
18	1815391
19	2476081
20	3092911
21	4049041
22	4992271
23	6436321
24	7642351
25	9753121
26	11509711
27	14230321
28	16649791
29	20511121
30	23316991
31	28629121
32	32472031
33	38810881

[1, 31, 241, 991, 3121, 7471, 16801, 31711, 58561, 96751, 161041, 238831, 371281, 520831, 752161, 1014751, 1419841, 1815391, 2476081, 3092911, 4049041, 4992271, 6436321, 7642351, 9753121, 11509711, 14230321, 16649791, 20511121, 23316991, 28629121, 32472031, 38810881]

cp's OEIS Frontend

A372961 a(n) = Sum_{1 <= x_1, x_2, x_3, x_4 <= n} n/gcd(x_1, x_2, x_3, x_4, n).

Table of values

List of values