A219864 - cp's OEIS frontend

A219864 Number of ways to write n as p+q with p and 2pq+1 both prime.

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

[0, 0, 1, 1, 2, 3, 0, 2, 4, 2, 2, 4, 1, 2, 6, 3, 1, 2, 2, 5, 3, 1, 1, 7, 2, 6, 3, 1, 6, 8, 2, 2, 5, 3, 3, 8, 2, 4, 6, 3, 4, 4, 1, 3, 7, 2, 3, 7, 3, 6, 8, 2, 1, 12, 5, 4, 7, 4, 7, 7, 7, 5, 4, 4, 6, 9, 2, 2, 13, 2, 5, 7, 2, 4, 18, 6, 3, 5, 6, 5, 8, 4, 2, 9, 4, 10, 5, 2, 5, 17, 3, 3, 7, 7, 5, 8, 3, 3, 17, 8]

cp's OEIS Frontend

A219864 Number of ways to write n as p+q with p and 2pq+1 both prime.

Table of values

List of values

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

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

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