A236256 - cp's OEIS frontend

A236256 a(n) = |{0 < k < n: m = phi(k) + phi(n-k)/4 is an integer with C(2m, m) - prime(m) prime}|, where C(2m, m) = (2*m)!/(m!)^2.

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

[0, 0, 0, 0, 0, 1, 1, 0, 1, 2, 1, 1, 3, 1, 2, 2, 3, 3, 2, 5, 2, 2, 2, 4, 3, 3, 3, 2, 2, 3, 4, 5, 1, 5, 7, 5, 2, 4, 6, 7, 4, 3, 3, 4, 5, 6, 3, 3, 3, 5, 3, 4, 1, 5, 3, 0, 4, 2, 1, 3, 2, 4, 2, 5, 1, 4, 3, 5, 1, 5, 1, 2, 0, 2, 3, 1, 3, 4, 1, 2, 3, 3, 3, 2, 3, 2, 2]

cp's OEIS Frontend

A236256 a(n) = |{0 < k < n: m = phi(k) + phi(n-k)/4 is an integer with C(2m, m) - prime(m) prime}|, where C(2m, m) = (2*m)!/(m!)^2.

Table of values

List of values

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

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

cp's OEIS Frontend

A236256 a(n) = |{0 < k < n: m = phi(k) + phi(n-k)/4 is an integer with C(2*m, m) - prime(m) prime}|, where C(2*m, m) = (2*m)!/(m!)^2.

Table of values

List of values

A236256 a(n) = |{0 < k < n: m = phi(k) + phi(n-k)/4 is an integer with C(2m, m) - prime(m) prime}|, where C(2m, m) = (2*m)!/(m!)^2.

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