A224961 - cp's OEIS frontend

A224961 a(n) = number of primes of the form p * q + 2 where p is the prime(n) and q is any prime < p.

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

[0, 0, 1, 2, 1, 2, 2, 3, 3, 2, 1, 4, 0, 4, 4, 4, 5, 4, 4, 3, 2, 4, 4, 3, 5, 3, 4, 4, 6, 4, 7, 4, 4, 7, 5, 5, 6, 5, 6, 8, 5, 7, 7, 6, 3, 9, 5, 8, 5, 8, 7, 10, 9, 7, 8, 8, 5, 8, 8, 9, 8, 8, 10, 7, 11, 13, 8, 10, 10, 10, 11, 9, 12, 9, 13, 11, 9, 12, 7, 11]

cp's OEIS Frontend

A224961 a(n) = number of primes of the form p * q + 2 where p is the prime(n) and q is any prime < p.

Table of values

List of values

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

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

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