A087508 - cp's OEIS frontend

A087508 Number of k such that mod(k*n,3) = 1 for 0 <= k <= n.

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

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

cp's OEIS Frontend

A087508 Number of k such that mod(k*n,3) = 1 for 0 <= k <= n.

Table of values

List of values

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

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

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