A382074 - cp's OEIS frontend

A382074 a(n) is the number of solutions to phi(x) + phi(n-x) = phi(n) where 1 <= x <= floor(n/2).

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

[0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 0, 2, 2, 1, 0, 1, 0, 3, 2, 2, 0, 2, 2, 2, 2, 4, 0, 0, 0, 1, 3, 1, 1, 2, 0, 3, 1, 4, 0, 1, 0, 5, 3, 2, 0, 2, 0, 2, 3, 5, 0, 2, 1, 5, 2, 1, 0, 1, 0, 2, 2, 1, 2, 2, 0, 5, 2, 2, 0, 3, 0, 2, 4, 5, 1, 3, 0, 4, 0, 1, 0, 2, 2, 2, 4, 5]

cp's OEIS Frontend

A382074 a(n) is the number of solutions to phi(x) + phi(n-x) = phi(n) where 1 <= x <= floor(n/2).

Table of values

List of values

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

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

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