A322006 - cp's OEIS frontend

A322006 a(n) = number of primes of the form p = n - q, where q is a prime or semiprime.

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

[0, 0, 0, 0, 1, 2, 2, 3, 3, 4, 3, 3, 4, 4, 4, 4, 6, 5, 5, 4, 6, 5, 7, 4, 8, 5, 8, 5, 9, 4, 7, 4, 8, 7, 9, 4, 11, 5, 9, 6, 11, 6, 11, 6, 11, 8, 12, 4, 13, 6, 12, 8, 13, 6, 14, 5, 13, 8, 13, 4, 16, 5, 15, 9, 16, 7, 16, 6, 14, 9, 16, 5, 18, 6, 16, 10, 19, 7, 19, 6, 17, 10, 18, 4, 21, 9, 17, 9, 19, 8]

cp's OEIS Frontend

A322006 a(n) = number of primes of the form p = n - q, where q is a prime or semiprime.

Table of values

List of values

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

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

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