A344521 - cp's OEIS frontend

A344521 a(n) = Sum_{1 <= i <= j <= k <= n} gcd(i,j,k).

n	a(n)
1	1
2	5
3	13
4	28
5	47
6	82
7	116
8	172
9	235
10	321
11	397
12	538
13	641
14	798
15	980
16	1192
17	1361
18	1655
19	1863
20	2218
21	2553
22	2912
23	3210
24	3766
25	4171
26	4661
27	5183
28	5840
29	6303
30	7168
31	7694
32	8510
33	9283
34	10095
35	10951
36	12190
37	12929
38	13932
39	14990
40	16414
41	17315
42	18925
43	19913
44	21438
45	23055
46	24500
47	25674
48	27862

[1, 5, 13, 28, 47, 82, 116, 172, 235, 321, 397, 538, 641, 798, 980, 1192, 1361, 1655, 1863, 2218, 2553, 2912, 3210, 3766, 4171, 4661, 5183, 5840, 6303, 7168, 7694, 8510, 9283, 10095, 10951, 12190, 12929, 13932, 14990, 16414, 17315, 18925, 19913, 21438, 23055, 24500, 25674, 27862]

cp's OEIS Frontend

A344521 a(n) = Sum_{1 <= i <= j <= k <= n} gcd(i,j,k).

Table of values

List of values