A110174 - cp's OEIS frontend

A110174 Number of solutions 0 to the equation phi(n) = phi(k) + phi(n-k), where phi is Euler's totient function.

n	a(n)
1	0
2	0
3	2
4	1
5	0
6	0
7	0
8	1
9	2
10	2
11	0
12	1
13	0
14	4
15	4
16	1
17	0
18	2
19	0
20	5
21	4
22	4
23	0
24	3
25	4
26	4
27	4
28	7
29	0
30	0
31	0
32	1
33	6
34	2
35	2
36	3
37	0
38	6
39	2
40	7
41	0
42	2
43	0
44	9
45	6
46	4
47	0
48	3
49	0
50	4
51	6
52	9
53	0
54	4
55	2
56	9
57	4
58	2
59	0
60	1
61	0
62	4
63	4
64	1
65	4
66	4
67	0
68	9
69	4
70	4
71	0
72	5
73	0
74	4
75	8
76	9
77	2
78	6
79	0
80	7
81	0
82	2
83	0
84	3
85	4
86	4
87	8
88	9
89	0
90	2
91	0
92	11
93	8
94	4
95	0
96	3
97	0
98	2
99	6
100	9
101	0
102	6
103	0

[0, 0, 2, 1, 0, 0, 0, 1, 2, 2, 0, 1, 0, 4, 4, 1, 0, 2, 0, 5, 4, 4, 0, 3, 4, 4, 4, 7, 0, 0, 0, 1, 6, 2, 2, 3, 0, 6, 2, 7, 0, 2, 0, 9, 6, 4, 0, 3, 0, 4, 6, 9, 0, 4, 2, 9, 4, 2, 0, 1, 0, 4, 4, 1, 4, 4, 0, 9, 4, 4, 0, 5, 0, 4, 8, 9, 2, 6, 0, 7, 0, 2, 0, 3, 4, 4, 8, 9, 0, 2, 0, 11, 8, 4, 0, 3, 0, 2, 6, 9, 0, 6, 0]

cp's OEIS Frontend

A110174 Number of solutions 0 to the equation phi(n) = phi(k) + phi(n-k), where phi is Euler's totient function.

Table of values

List of values

n	a(n)
1	0
2	0
3	2
4	1
5	0
6	0
7	0
8	1
9	2
10	2
11	0
12	1
13	0
14	4
15	4
16	1
17	0
18	2
19	0
20	5
21	4
22	4
23	0
24	3
25	4
26	4
27	4
28	7
29	0
30	0
31	0
32	1
33	6
34	2
35	2
36	3
37	0
38	6
39	2
40	7
41	0
42	2
43	0
44	9
45	6
46	4
47	0
48	3
49	0
50	4
51	6
52	9
53	0
54	4
55	2
56	9
57	4
58	2
59	0
60	1
61	0
62	4
63	4
64	1
65	4
66	4
67	0
68	9
69	4
70	4
71	0
72	5
73	0
74	4
75	8
76	9
77	2
78	6
79	0
80	7
81	0
82	2
83	0
84	3
85	4
86	4
87	8
88	9
89	0
90	2
91	0
92	11
93	8
94	4
95	0
96	3
97	0
98	2
99	6
100	9
101	0
102	6
103	0

n	a(n)
1	0
2	0
3	2
4	1
5	0
6	0
7	0
8	1
9	2
10	2
11	0
12	1
13	0
14	4
15	4
16	1
17	0
18	2
19	0
20	5
21	4
22	4
23	0
24	3
25	4
26	4
27	4
28	7
29	0
30	0
31	0
32	1
33	6
34	2
35	2
36	3
37	0
38	6
39	2
40	7
41	0
42	2
43	0
44	9
45	6
46	4
47	0
48	3
49	0
50	4
51	6
52	9
53	0
54	4
55	2
56	9
57	4
58	2
59	0
60	1
61	0
62	4
63	4
64	1
65	4
66	4
67	0
68	9
69	4
70	4
71	0
72	5
73	0
74	4
75	8
76	9
77	2
78	6
79	0
80	7
81	0
82	2
83	0
84	3
85	4
86	4
87	8
88	9
89	0
90	2
91	0
92	11
93	8
94	4
95	0
96	3
97	0
98	2
99	6
100	9
101	0
102	6
103	0

n	a(n)
1	0
2	0
3	2
4	1
5	0
6	0
7	0
8	1
9	2
10	2
11	0
12	1
13	0
14	4
15	4
16	1
17	0
18	2
19	0
20	5
21	4
22	4
23	0
24	3
25	4
26	4
27	4
28	7
29	0
30	0
31	0
32	1
33	6
34	2
35	2
36	3
37	0
38	6
39	2
40	7
41	0
42	2
43	0
44	9
45	6
46	4
47	0
48	3
49	0
50	4
51	6
52	9
53	0
54	4
55	2
56	9
57	4
58	2
59	0
60	1
61	0
62	4
63	4
64	1
65	4
66	4
67	0
68	9
69	4
70	4
71	0
72	5
73	0
74	4
75	8
76	9
77	2
78	6
79	0
80	7
81	0
82	2
83	0
84	3
85	4
86	4
87	8
88	9
89	0
90	2
91	0
92	11
93	8
94	4
95	0
96	3
97	0
98	2
99	6
100	9
101	0
102	6
103	0