A212648 - cp's OEIS frontend

A212648 Minimal m >= 0 such that (2*n-1)!! - 2^m is prime.

n	a(n)
2	0
3	1
4	1
5	2
6	2
7	2
8	1
9	1
10	1
11	6
12	9
13	2
14	6
15	6
16	8
17	16
18	2
19	15
20	6
21	3
22	3
23	5
24	7
25	26
26	1
27	8
28	16
29	18
30	7
31	14
32	12
33	9
34	5
35	14
36	8
37	1
38	32
39	7
40	2
41	2
42	3
43	53
44	8
45	1
46	3
47	10
48	10
49	20
50	8
51	25
52	20
53	2
54	23
55	7
56	13
57	21
58	87
59	16
60	76
61	35
62	30
63	18
64	12
65	7
66	1
67	117
68	36
69	40
70	57
71	25
72	3
73	5
74	47
75	62

[0, 1, 1, 2, 2, 2, 1, 1, 1, 6, 9, 2, 6, 6, 8, 16, 2, 15, 6, 3, 3, 5, 7, 26, 1, 8, 16, 18, 7, 14, 12, 9, 5, 14, 8, 1, 32, 7, 2, 2, 3, 53, 8, 1, 3, 10, 10, 20, 8, 25, 20, 2, 23, 7, 13, 21, 87, 16, 76, 35, 30, 18, 12, 7, 1, 117, 36, 40, 57, 25, 3, 5, 47, 62]

cp's OEIS Frontend

A212648 Minimal m >= 0 such that (2*n-1)!! - 2^m is prime.

Table of values

List of values

n	a(n)
2	0
3	1
4	1
5	2
6	2
7	2
8	1
9	1
10	1
11	6
12	9
13	2
14	6
15	6
16	8
17	16
18	2
19	15
20	6
21	3
22	3
23	5
24	7
25	26
26	1
27	8
28	16
29	18
30	7
31	14
32	12
33	9
34	5
35	14
36	8
37	1
38	32
39	7
40	2
41	2
42	3
43	53
44	8
45	1
46	3
47	10
48	10
49	20
50	8
51	25
52	20
53	2
54	23
55	7
56	13
57	21
58	87
59	16
60	76
61	35
62	30
63	18
64	12
65	7
66	1
67	117
68	36
69	40
70	57
71	25
72	3
73	5
74	47
75	62

n	a(n)
2	0
3	1
4	1
5	2
6	2
7	2
8	1
9	1
10	1
11	6
12	9
13	2
14	6
15	6
16	8
17	16
18	2
19	15
20	6
21	3
22	3
23	5
24	7
25	26
26	1
27	8
28	16
29	18
30	7
31	14
32	12
33	9
34	5
35	14
36	8
37	1
38	32
39	7
40	2
41	2
42	3
43	53
44	8
45	1
46	3
47	10
48	10
49	20
50	8
51	25
52	20
53	2
54	23
55	7
56	13
57	21
58	87
59	16
60	76
61	35
62	30
63	18
64	12
65	7
66	1
67	117
68	36
69	40
70	57
71	25
72	3
73	5
74	47
75	62

n	a(n)
2	0
3	1
4	1
5	2
6	2
7	2
8	1
9	1
10	1
11	6
12	9
13	2
14	6
15	6
16	8
17	16
18	2
19	15
20	6
21	3
22	3
23	5
24	7
25	26
26	1
27	8
28	16
29	18
30	7
31	14
32	12
33	9
34	5
35	14
36	8
37	1
38	32
39	7
40	2
41	2
42	3
43	53
44	8
45	1
46	3
47	10
48	10
49	20
50	8
51	25
52	20
53	2
54	23
55	7
56	13
57	21
58	87
59	16
60	76
61	35
62	30
63	18
64	12
65	7
66	1
67	117
68	36
69	40
70	57
71	25
72	3
73	5
74	47
75	62