A344138 - cp's OEIS frontend

A344138 a(n) = Sum_{x_1|n, x_2|n, x_3|n, x_4|n} gcd(x_1,x_2,x_3,x_4).

n	a(n)
1	1
2	17
3	18
4	99
5	20
6	306
7	22
8	373
9	119
10	340
11	26
12	1782
13	28
14	374
15	360
16	1115
17	32
18	2023
19	34
20	1980
21	396
22	442
23	38
24	6714
25	165
26	476
27	532
28	2178
29	44
30	6120
31	46
32	2901
33	468
34	544
35	440
36	11781
37	52
38	578
39	504
40	7460
41	56
42	6732
43	58
44	2574
45	2380
46	646
47	62
48	20070
49	219
50	2805
51	576
52	2772
53	68
54	9044
55	520
56	8206
57	612
58	748
59	74
60	35640
61	76

[1, 17, 18, 99, 20, 306, 22, 373, 119, 340, 26, 1782, 28, 374, 360, 1115, 32, 2023, 34, 1980, 396, 442, 38, 6714, 165, 476, 532, 2178, 44, 6120, 46, 2901, 468, 544, 440, 11781, 52, 578, 504, 7460, 56, 6732, 58, 2574, 2380, 646, 62, 20070, 219, 2805, 576, 2772, 68, 9044, 520, 8206, 612, 748, 74, 35640, 76]

cp's OEIS Frontend

A344138 a(n) = Sum_{x_1|n, x_2|n, x_3|n, x_4|n} gcd(x_1,x_2,x_3,x_4).

Table of values

List of values