A061866 - cp's OEIS frontend

A061866 a(n) is the number of solutions to x+y+z = 0 mod 3, where 1 <= x < y < z <= n.

n	a(n)
0	0
1	0
2	0
3	1
4	2
5	4
6	8
7	13
8	20
9	30
10	42
11	57
12	76
13	98
14	124
15	155
16	190
17	230
18	276
19	327
20	384
21	448
22	518
23	595
24	680
25	772
26	872
27	981
28	1098
29	1224
30	1360
31	1505
32	1660
33	1826
34	2002
35	2189
36	2388
37	2598
38	2820
39	3055
40	3302
41	3562
42	3836
43	4123
44	4424
45	4740
46	5070
47	5415
48	5776
49	6152
50	6544
51	6953
52	7378
53	7820

[0, 0, 0, 1, 2, 4, 8, 13, 20, 30, 42, 57, 76, 98, 124, 155, 190, 230, 276, 327, 384, 448, 518, 595, 680, 772, 872, 981, 1098, 1224, 1360, 1505, 1660, 1826, 2002, 2189, 2388, 2598, 2820, 3055, 3302, 3562, 3836, 4123, 4424, 4740, 5070, 5415, 5776, 6152, 6544, 6953, 7378, 7820]

cp's OEIS Frontend

A061866 a(n) is the number of solutions to x+y+z = 0 mod 3, where 1 <= x < y < z <= n.

Table of values

List of values