A239476 - cp's OEIS frontend

A239476 Number of values of k such that 2^k + (6n+3) and (6n+3)*2^k - 1 are both prime, k < 6n+3.

n	a(n)
0	2
1	3
2	5
3	3
4	7
5	3
6	1
7	6
8	2
9	6
10	6
11	5
12	4
13	3
14	2
15	4
16	5
17	4
18	1
19	3
20	2
21	3
22	3
23	1
24	7
25	2
26	2
27	10
28	1
29	4
30	1
31	2
32	4
33	0
34	3
35	5
36	1
37	3
38	4
39	3
40	5
41	1
42	5
43	4
44	6
45	4
46	2
47	1
48	2
49	4
50	4
51	1
52	5
53	1
54	4
55	3
56	2
57	4
58	3
59	5
60	6
61	2
62	6
63	3
64	2
65	2
66	2
67	1
68	4
69	2
70	1
71	2
72	3
73	3
74	4
75	4
76	4
77	2
78	3
79	4
80	7
81	5
82	2
83	1
84	4
85	2
86	1
87	6
88	2
89	3
90	2
91	3
92	5
93	0
94	5
95	0
96	0
97	2
98	2
99	4
100	4
101	3

[2, 3, 5, 3, 7, 3, 1, 6, 2, 6, 6, 5, 4, 3, 2, 4, 5, 4, 1, 3, 2, 3, 3, 1, 7, 2, 2, 10, 1, 4, 1, 2, 4, 0, 3, 5, 1, 3, 4, 3, 5, 1, 5, 4, 6, 4, 2, 1, 2, 4, 4, 1, 5, 1, 4, 3, 2, 4, 3, 5, 6, 2, 6, 3, 2, 2, 2, 1, 4, 2, 1, 2, 3, 3, 4, 4, 4, 2, 3, 4, 7, 5, 2, 1, 4, 2, 1, 6, 2, 3, 2, 3, 5, 0, 5, 0, 0, 2, 2, 4, 4, 3]

cp's OEIS Frontend

A239476 Number of values of k such that 2^k + (6n+3) and (6n+3)*2^k - 1 are both prime, k < 6n+3.

Table of values

List of values

n	a(n)
0	2
1	3
2	5
3	3
4	7
5	3
6	1
7	6
8	2
9	6
10	6
11	5
12	4
13	3
14	2
15	4
16	5
17	4
18	1
19	3
20	2
21	3
22	3
23	1
24	7
25	2
26	2
27	10
28	1
29	4
30	1
31	2
32	4
33	0
34	3
35	5
36	1
37	3
38	4
39	3
40	5
41	1
42	5
43	4
44	6
45	4
46	2
47	1
48	2
49	4
50	4
51	1
52	5
53	1
54	4
55	3
56	2
57	4
58	3
59	5
60	6
61	2
62	6
63	3
64	2
65	2
66	2
67	1
68	4
69	2
70	1
71	2
72	3
73	3
74	4
75	4
76	4
77	2
78	3
79	4
80	7
81	5
82	2
83	1
84	4
85	2
86	1
87	6
88	2
89	3
90	2
91	3
92	5
93	0
94	5
95	0
96	0
97	2
98	2
99	4
100	4
101	3

n	a(n)
0	2
1	3
2	5
3	3
4	7
5	3
6	1
7	6
8	2
9	6
10	6
11	5
12	4
13	3
14	2
15	4
16	5
17	4
18	1
19	3
20	2
21	3
22	3
23	1
24	7
25	2
26	2
27	10
28	1
29	4
30	1
31	2
32	4
33	0
34	3
35	5
36	1
37	3
38	4
39	3
40	5
41	1
42	5
43	4
44	6
45	4
46	2
47	1
48	2
49	4
50	4
51	1
52	5
53	1
54	4
55	3
56	2
57	4
58	3
59	5
60	6
61	2
62	6
63	3
64	2
65	2
66	2
67	1
68	4
69	2
70	1
71	2
72	3
73	3
74	4
75	4
76	4
77	2
78	3
79	4
80	7
81	5
82	2
83	1
84	4
85	2
86	1
87	6
88	2
89	3
90	2
91	3
92	5
93	0
94	5
95	0
96	0
97	2
98	2
99	4
100	4
101	3

n	a(n)
0	2
1	3
2	5
3	3
4	7
5	3
6	1
7	6
8	2
9	6
10	6
11	5
12	4
13	3
14	2
15	4
16	5
17	4
18	1
19	3
20	2
21	3
22	3
23	1
24	7
25	2
26	2
27	10
28	1
29	4
30	1
31	2
32	4
33	0
34	3
35	5
36	1
37	3
38	4
39	3
40	5
41	1
42	5
43	4
44	6
45	4
46	2
47	1
48	2
49	4
50	4
51	1
52	5
53	1
54	4
55	3
56	2
57	4
58	3
59	5
60	6
61	2
62	6
63	3
64	2
65	2
66	2
67	1
68	4
69	2
70	1
71	2
72	3
73	3
74	4
75	4
76	4
77	2
78	3
79	4
80	7
81	5
82	2
83	1
84	4
85	2
86	1
87	6
88	2
89	3
90	2
91	3
92	5
93	0
94	5
95	0
96	0
97	2
98	2
99	4
100	4
101	3