A210481 - cp's OEIS frontend

A210481 Given n-th prime p, a(n) = number of primes of the form p * q - 2 where q is any prime < p.

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

[0, 0, 1, 1, 2, 2, 1, 1, 4, 2, 2, 4, 3, 2, 4, 3, 4, 3, 4, 4, 6, 3, 4, 5, 3, 5, 5, 4, 3, 6, 4, 7, 5, 4, 6, 5, 7, 9, 7, 5, 6, 5, 6, 6, 8, 5, 7, 9, 5, 6, 7, 5, 7, 7, 9, 10, 3, 11, 8, 11, 6, 9, 8, 12, 8, 9, 7, 10, 9, 7, 8, 8, 6, 14, 8, 10, 11, 11, 12, 11, 7, 7]

cp's OEIS Frontend

A210481 Given n-th prime p, a(n) = number of primes of the form p * q - 2 where q is any prime < p.

Table of values

List of values

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

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

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