A230243 - cp's OEIS frontend

A230243 Number of primes p < n with 3p + 8 and (p-1)n + 1 both prime.

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

[0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 1, 3, 1, 4, 2, 1, 4, 2, 2, 4, 2, 3, 2, 4, 3, 4, 4, 2, 2, 2, 1, 5, 3, 4, 3, 3, 2, 3, 4, 2, 2, 4, 2, 4, 4, 1, 5, 3, 2, 6, 4, 1, 5, 6, 3, 3, 5, 1, 5, 5, 2, 7, 5, 3, 4, 4, 3, 4, 6, 3, 4, 6, 4, 5, 6, 3, 7, 4, 2, 6, 1, 3, 5, 9, 3, 3, 7, 4, 3, 7, 1, 6, 5, 5, 5, 6, 3, 6, 7]

cp's OEIS Frontend

A230243 Number of primes p < n with 3p + 8 and (p-1)n + 1 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	1
9	2
10	2
11	2
12	1
13	3
14	1
15	4
16	2
17	1
18	4
19	2
20	2
21	4
22	2
23	3
24	2
25	4
26	3
27	4
28	4
29	2
30	2
31	2
32	1
33	5
34	3
35	4
36	3
37	3
38	2
39	3
40	4
41	2
42	2
43	4
44	2
45	4
46	4
47	1
48	5
49	3
50	2
51	6
52	4
53	1
54	5
55	6
56	3
57	3
58	5
59	1
60	5
61	5
62	2
63	7
64	5
65	3
66	4
67	4
68	3
69	4
70	6
71	3
72	4
73	6
74	4
75	5
76	6
77	3
78	7
79	4
80	2
81	6
82	1
83	3
84	5
85	9
86	3
87	3
88	7
89	4
90	3
91	7
92	1
93	6
94	5
95	5
96	5
97	6
98	3
99	6
100	7

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

cp's OEIS Frontend

A230243 Number of primes p < n with 3*p + 8 and (p-1)*n + 1 both prime.

Table of values

List of values

A230243 Number of primes p < n with 3p + 8 and (p-1)n + 1 both prime.

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