A236241 - cp's OEIS frontend

A236241 a(n) = |{0 < k < n: m = phi(k) + phi(n-k)/8 is an integer with C(2m, m) + prime(m) prime}|, where C(2m, m) = (2*m)!/(m!)^2, and phi(.) is Euler's totient function.

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

[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 4, 2, 3, 4, 5, 2, 2, 2, 3, 4, 3, 2, 4, 4, 6, 3, 5, 8, 9, 6, 6, 4, 5, 5, 4, 5, 6, 6, 4, 4, 4, 10, 9, 7, 4, 4, 5, 7, 2, 2, 3, 7, 7, 5, 7, 6, 7, 5, 4, 7, 5, 5, 3, 8, 6, 4, 6, 5, 8, 9, 5, 4, 3]

cp's OEIS Frontend

A236241 a(n) = |{0 < k < n: m = phi(k) + phi(n-k)/8 is an integer with C(2m, m) + prime(m) prime}|, where C(2m, m) = (2*m)!/(m!)^2, and phi(.) is Euler's totient function.

Table of values

List of values

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

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

cp's OEIS Frontend

A236241 a(n) = |{0 < k < n: m = phi(k) + phi(n-k)/8 is an integer with C(2*m, m) + prime(m) prime}|, where C(2*m, m) = (2*m)!/(m!)^2, and phi(.) is Euler's totient function.

Table of values

List of values

A236241 a(n) = |{0 < k < n: m = phi(k) + phi(n-k)/8 is an integer with C(2m, m) + prime(m) prime}|, where C(2m, m) = (2*m)!/(m!)^2, and phi(.) is Euler's totient function.

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