A224925 - cp's OEIS frontend

A224925 a(n) = number of primes of the form p*q-(p+q) where p = prime(n) and q is any prime < p.

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

[0, 0, 2, 3, 2, 4, 2, 4, 3, 2, 7, 4, 5, 8, 2, 4, 2, 8, 7, 6, 11, 7, 6, 5, 10, 4, 11, 4, 11, 5, 14, 6, 6, 12, 4, 17, 10, 14, 5, 4, 4, 14, 6, 12, 9, 14, 24, 14, 7, 14, 11, 6, 21, 11, 6, 7, 6, 23, 15, 13, 18, 8, 18, 11, 22, 8, 29, 16, 11, 22, 9, 7, 21, 19, 26]

cp's OEIS Frontend

A224925 a(n) = number of primes of the form p*q-(p+q) where p = prime(n) and q is any prime < p.

Table of values

List of values

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

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

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