A165186 - cp's OEIS frontend

A165186 a(n) = Sum_{k=1..n} (k*(n-k) mod n).

n	a(n)
1	0
2	1
3	4
4	6
5	10
6	17
7	28
8	36
9	30
10	45
11	66
12	82
13	78
14	105
15	140
16	136
17	136
18	141
19	190
20	230
21	238
22	253
23	322
24	380
25	250
26	325
27	360
28	434
29	406
30	505
31	558
32	592
33	572
34	561
35	700
36	678
37	666
38	741
39	910
40	980
41	820
42	917
43	946
44	1122
45	1050
46	1173
47	1316
48	1432
49	1078
50	1125
51	1394
52	1430
53	1378
54	1449

[0, 1, 4, 6, 10, 17, 28, 36, 30, 45, 66, 82, 78, 105, 140, 136, 136, 141, 190, 230, 238, 253, 322, 380, 250, 325, 360, 434, 406, 505, 558, 592, 572, 561, 700, 678, 666, 741, 910, 980, 820, 917, 946, 1122, 1050, 1173, 1316, 1432, 1078, 1125, 1394, 1430, 1378, 1449]

cp's OEIS Frontend

A165186 a(n) = Sum_{k=1..n} (k*(n-k) mod n).

Table of values

List of values