A087509 - cp's OEIS frontend

A087509 Number of k such that (k*n) == 2 (mod 3) for 0 <= k <= n.

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

[0, 0, 1, 0, 1, 2, 0, 2, 3, 0, 3, 4, 0, 4, 5, 0, 5, 6, 0, 6, 7, 0, 7, 8, 0, 8, 9, 0, 9, 10, 0, 10, 11, 0, 11, 12, 0, 12, 13, 0, 13, 14, 0, 14, 15, 0, 15, 16, 0, 16, 17, 0, 17, 18, 0, 18, 19, 0, 19, 20, 0, 20, 21, 0, 21, 22, 0, 22, 23, 0, 23, 24, 0, 24, 25, 0, 25, 26, 0, 26, 27, 0, 27, 28, 0, 28]

cp's OEIS Frontend

A087509 Number of k such that (k*n) == 2 (mod 3) for 0 <= k <= n.

Table of values

List of values

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

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

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