A182425 - cp's OEIS frontend

A182425 a(n) the largest integer K such that (prime(n+1)-1)^(2^k)+1 for 0<=k<=K is prime.

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

[4, 3, 2, 1, 0, 2, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 2, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 2, 0, 0, 0, 0, 0]

cp's OEIS Frontend

A182425 a(n) the largest integer K such that (prime(n+1)-1)^(2^k)+1 for 0<=k<=K is prime.

Table of values

List of values

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

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

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