A229288 - cp's OEIS frontend

A229288 Least k such that the numerator of the continued fraction [2,..,2,k] (n 2s) is prime.

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	1
7	1
8	5
9	2
10	15
11	2
12	13
13	6
14	3
15	1
16	5
17	3
18	1
19	5
20	13
21	12
22	55
23	6
24	97
25	6
26	9
27	2
28	1
29	5
30	39
31	28
32	7
33	14
34	31
35	11
36	83
37	21
38	51
39	2
40	31
41	30
42	51
43	4
44	7
45	3
46	1
47	40
48	37
49	21
50	27
51	2
52	95
53	15
54	9
55	14
56	5
57	2
58	1
59	11
60	107
61	6
62	51
63	18
64	31
65	9
66	13
67	13
68	13
69	9
70	81
71	7
72	90
73	13
74	19

[1, 1, 1, 1, 3, 1, 1, 5, 2, 15, 2, 13, 6, 3, 1, 5, 3, 1, 5, 13, 12, 55, 6, 97, 6, 9, 2, 1, 5, 39, 28, 7, 14, 31, 11, 83, 21, 51, 2, 31, 30, 51, 4, 7, 3, 1, 40, 37, 21, 27, 2, 95, 15, 9, 14, 5, 2, 1, 11, 107, 6, 51, 18, 31, 9, 13, 13, 13, 9, 81, 7, 90, 13, 19]

cp's OEIS Frontend

A229288 Least k such that the numerator of the continued fraction [2,..,2,k] (n 2s) is prime.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	1
7	1
8	5
9	2
10	15
11	2
12	13
13	6
14	3
15	1
16	5
17	3
18	1
19	5
20	13
21	12
22	55
23	6
24	97
25	6
26	9
27	2
28	1
29	5
30	39
31	28
32	7
33	14
34	31
35	11
36	83
37	21
38	51
39	2
40	31
41	30
42	51
43	4
44	7
45	3
46	1
47	40
48	37
49	21
50	27
51	2
52	95
53	15
54	9
55	14
56	5
57	2
58	1
59	11
60	107
61	6
62	51
63	18
64	31
65	9
66	13
67	13
68	13
69	9
70	81
71	7
72	90
73	13
74	19

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	1
7	1
8	5
9	2
10	15
11	2
12	13
13	6
14	3
15	1
16	5
17	3
18	1
19	5
20	13
21	12
22	55
23	6
24	97
25	6
26	9
27	2
28	1
29	5
30	39
31	28
32	7
33	14
34	31
35	11
36	83
37	21
38	51
39	2
40	31
41	30
42	51
43	4
44	7
45	3
46	1
47	40
48	37
49	21
50	27
51	2
52	95
53	15
54	9
55	14
56	5
57	2
58	1
59	11
60	107
61	6
62	51
63	18
64	31
65	9
66	13
67	13
68	13
69	9
70	81
71	7
72	90
73	13
74	19

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	1
7	1
8	5
9	2
10	15
11	2
12	13
13	6
14	3
15	1
16	5
17	3
18	1
19	5
20	13
21	12
22	55
23	6
24	97
25	6
26	9
27	2
28	1
29	5
30	39
31	28
32	7
33	14
34	31
35	11
36	83
37	21
38	51
39	2
40	31
41	30
42	51
43	4
44	7
45	3
46	1
47	40
48	37
49	21
50	27
51	2
52	95
53	15
54	9
55	14
56	5
57	2
58	1
59	11
60	107
61	6
62	51
63	18
64	31
65	9
66	13
67	13
68	13
69	9
70	81
71	7
72	90
73	13
74	19