A209315 - cp's OEIS frontend

A209315 Number of ways to write 2n-1 = p+q with q practical, p and q-p both prime.

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

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

cp's OEIS Frontend

A209315 Number of ways to write 2n-1 = p+q with q practical, p and q-p both prime.

Table of values

List of values

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

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

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