A185279 - cp's OEIS frontend

A185279 a(n) = number of ways that one can write n as the sum of two positive integers such that i) the integers are relatively prime to n but ii) the integers are not themselves prime.

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

[0, 1, 0, 0, 1, 0, 1, 0, 1, 1, 1, 0, 2, 0, 1, 1, 2, 0, 3, 0, 1, 1, 3, 0, 3, 1, 1, 1, 5, 0, 6, 0, 2, 2, 3, 1, 7, 0, 3, 1, 8, 0, 9, 1, 1, 2, 9, 0, 8, 1, 3, 2, 11, 0, 7, 1, 4, 3, 13, 0, 14, 1, 3, 4, 8, 1, 15, 1, 6, 1, 16, 0, 17, 3, 2, 4, 11, 1, 18, 0, 7, 4, 19, 0]

cp's OEIS Frontend

A185279 a(n) = number of ways that one can write n as the sum of two positive integers such that i) the integers are relatively prime to n but ii) the integers are not themselves prime.

Table of values

List of values

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

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

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