A232465 - cp's OEIS frontend

A232465 a(n) = |{0 < k <= n/2: prime(k) + prime(n-k) - 1 is prime}|.

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

[0, 1, 0, 1, 1, 0, 2, 1, 3, 1, 3, 1, 3, 1, 3, 4, 5, 2, 5, 2, 5, 5, 4, 5, 4, 5, 6, 8, 2, 8, 9, 11, 4, 6, 1, 3, 6, 8, 8, 7, 3, 11, 9, 8, 8, 9, 12, 8, 10, 10, 10, 8, 6, 3, 8, 11, 13, 14, 13, 15, 8, 15, 15, 14, 8, 18, 11, 14, 5, 10, 7, 10, 15, 12, 10, 5, 10, 11, 12, 16, 21, 15, 16, 14, 8, 15, 19, 14, 16, 18, 13, 10, 28, 21, 14, 20, 18, 24, 20, 19]

cp's OEIS Frontend

A232465 a(n) = |{0 < k <= n/2: prime(k) + prime(n-k) - 1 is prime}|.

Table of values

List of values

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

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

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