A332612 - cp's OEIS frontend

A332612 a(n) = Sum_{ i=2..n-1, j=1..i-1, gcd(i,j)=1 } (n-i)*(n-j).

n	a(n)
1	0
2	0
3	2
4	11
5	32
6	77
7	148
8	268
9	442
10	691
11	1018
12	1472
13	2036
14	2780
15	3686
16	4786
17	6100
18	7724
19	9598
20	11863
21	14454
22	17437
23	20818
24	24772
25	29172
26	34200
27	39794
28	46071
29	52986
30	60817
31	69314
32	78860
33	89292
34	100720
35	113122
36	126686
37	141244
38	157294
39	174566
40	193228
41	213172
42	234954
43	258058
44	283189
45	309946
46	338473
47	368782
48	401516
49	436040

[0, 0, 2, 11, 32, 77, 148, 268, 442, 691, 1018, 1472, 2036, 2780, 3686, 4786, 6100, 7724, 9598, 11863, 14454, 17437, 20818, 24772, 29172, 34200, 39794, 46071, 52986, 60817, 69314, 78860, 89292, 100720, 113122, 126686, 141244, 157294, 174566, 193228, 213172, 234954, 258058, 283189, 309946, 338473, 368782, 401516, 436040]

cp's OEIS Frontend

A332612 a(n) = Sum_{ i=2..n-1, j=1..i-1, gcd(i,j)=1 } (n-i)*(n-j).

Table of values

List of values