A166387 - cp's OEIS frontend

A166387 a(n) = sum (floor (j^2/n), 1 <= j <= n-1) - floor ((n-1)(n-2)/3), n >= 2.

n	a(n)
2	0
3	1
4	1
5	0
6	1
7	1
8	2
9	2
10	0
11	1
12	3
13	0
14	1
15	3
16	4
17	0
18	2
19	1
20	3
21	2
22	1
23	3
24	6
25	2
26	0
27	3
28	3
29	0
30	3
31	3
32	6
33	2
34	0
35	3
36	7
37	0
38	1
39	5
40	6
41	0
42	2
43	1
44	5
45	4
46	3
47	5
48	10
49	4
50	2
51	3
52	3
53	0
54	3
55	5
56	8
57	2
58	0
59	3
60	9
61	0
62	3
63	7
64	10
65	0
66	2
67	1
68	5
69	4
70	3
71	7
72	12
73	0
74	0
75	7
76	5
77	2
78	5
79	5
80	12
81	6
82	0
83	3
84	9
85	0
86	1
87	7
88	8
89	0
90	4
91	3
92	7
93	4
94	5
95	9
96	16
97	0
98	4

[0, 1, 1, 0, 1, 1, 2, 2, 0, 1, 3, 0, 1, 3, 4, 0, 2, 1, 3, 2, 1, 3, 6, 2, 0, 3, 3, 0, 3, 3, 6, 2, 0, 3, 7, 0, 1, 5, 6, 0, 2, 1, 5, 4, 3, 5, 10, 4, 2, 3, 3, 0, 3, 5, 8, 2, 0, 3, 9, 0, 3, 7, 10, 0, 2, 1, 5, 4, 3, 7, 12, 0, 0, 7, 5, 2, 5, 5, 12, 6, 0, 3, 9, 0, 1, 7, 8, 0, 4, 3, 7, 4, 5, 9, 16, 0, 4]

cp's OEIS Frontend

A166387 a(n) = sum (floor (j^2/n), 1 <= j <= n-1) - floor ((n-1)(n-2)/3), n >= 2.

Table of values

List of values

n	a(n)
2	0
3	1
4	1
5	0
6	1
7	1
8	2
9	2
10	0
11	1
12	3
13	0
14	1
15	3
16	4
17	0
18	2
19	1
20	3
21	2
22	1
23	3
24	6
25	2
26	0
27	3
28	3
29	0
30	3
31	3
32	6
33	2
34	0
35	3
36	7
37	0
38	1
39	5
40	6
41	0
42	2
43	1
44	5
45	4
46	3
47	5
48	10
49	4
50	2
51	3
52	3
53	0
54	3
55	5
56	8
57	2
58	0
59	3
60	9
61	0
62	3
63	7
64	10
65	0
66	2
67	1
68	5
69	4
70	3
71	7
72	12
73	0
74	0
75	7
76	5
77	2
78	5
79	5
80	12
81	6
82	0
83	3
84	9
85	0
86	1
87	7
88	8
89	0
90	4
91	3
92	7
93	4
94	5
95	9
96	16
97	0
98	4

n	a(n)
2	0
3	1
4	1
5	0
6	1
7	1
8	2
9	2
10	0
11	1
12	3
13	0
14	1
15	3
16	4
17	0
18	2
19	1
20	3
21	2
22	1
23	3
24	6
25	2
26	0
27	3
28	3
29	0
30	3
31	3
32	6
33	2
34	0
35	3
36	7
37	0
38	1
39	5
40	6
41	0
42	2
43	1
44	5
45	4
46	3
47	5
48	10
49	4
50	2
51	3
52	3
53	0
54	3
55	5
56	8
57	2
58	0
59	3
60	9
61	0
62	3
63	7
64	10
65	0
66	2
67	1
68	5
69	4
70	3
71	7
72	12
73	0
74	0
75	7
76	5
77	2
78	5
79	5
80	12
81	6
82	0
83	3
84	9
85	0
86	1
87	7
88	8
89	0
90	4
91	3
92	7
93	4
94	5
95	9
96	16
97	0
98	4

n	a(n)
2	0
3	1
4	1
5	0
6	1
7	1
8	2
9	2
10	0
11	1
12	3
13	0
14	1
15	3
16	4
17	0
18	2
19	1
20	3
21	2
22	1
23	3
24	6
25	2
26	0
27	3
28	3
29	0
30	3
31	3
32	6
33	2
34	0
35	3
36	7
37	0
38	1
39	5
40	6
41	0
42	2
43	1
44	5
45	4
46	3
47	5
48	10
49	4
50	2
51	3
52	3
53	0
54	3
55	5
56	8
57	2
58	0
59	3
60	9
61	0
62	3
63	7
64	10
65	0
66	2
67	1
68	5
69	4
70	3
71	7
72	12
73	0
74	0
75	7
76	5
77	2
78	5
79	5
80	12
81	6
82	0
83	3
84	9
85	0
86	1
87	7
88	8
89	0
90	4
91	3
92	7
93	4
94	5
95	9
96	16
97	0
98	4