A074717 - cp's OEIS frontend

A074717 Least k such that floor(2^n/k) is prime.

n	a(n)
1	1
2	2
3	3
4	3
5	6
6	9
7	11
8	11
9	7
10	9
11	5
12	10
13	19
14	11
15	5
16	10
17	9
18	11
19	22
20	35
21	39
22	9
23	5
24	10
25	20
26	27
27	11
28	19
29	9
30	18
31	36
32	25
33	29
34	27
35	5
36	10
37	20
38	40
39	61
40	13
41	21
42	42
43	29
44	27
45	39
46	9
47	17
48	29
49	58
50	49
51	27
52	25
53	50
54	11
55	22
56	44
57	39
58	11
59	22
60	44
61	29
62	58
63	116
64	53
65	19
66	38
67	76
68	152
69	237
70	139
71	5
72	10
73	20

[1, 2, 3, 3, 6, 9, 11, 11, 7, 9, 5, 10, 19, 11, 5, 10, 9, 11, 22, 35, 39, 9, 5, 10, 20, 27, 11, 19, 9, 18, 36, 25, 29, 27, 5, 10, 20, 40, 61, 13, 21, 42, 29, 27, 39, 9, 17, 29, 58, 49, 27, 25, 50, 11, 22, 44, 39, 11, 22, 44, 29, 58, 116, 53, 19, 38, 76, 152, 237, 139, 5, 10, 20]

cp's OEIS Frontend

A074717 Least k such that floor(2^n/k) is prime.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	3
5	6
6	9
7	11
8	11
9	7
10	9
11	5
12	10
13	19
14	11
15	5
16	10
17	9
18	11
19	22
20	35
21	39
22	9
23	5
24	10
25	20
26	27
27	11
28	19
29	9
30	18
31	36
32	25
33	29
34	27
35	5
36	10
37	20
38	40
39	61
40	13
41	21
42	42
43	29
44	27
45	39
46	9
47	17
48	29
49	58
50	49
51	27
52	25
53	50
54	11
55	22
56	44
57	39
58	11
59	22
60	44
61	29
62	58
63	116
64	53
65	19
66	38
67	76
68	152
69	237
70	139
71	5
72	10
73	20

n	a(n)
1	1
2	2
3	3
4	3
5	6
6	9
7	11
8	11
9	7
10	9
11	5
12	10
13	19
14	11
15	5
16	10
17	9
18	11
19	22
20	35
21	39
22	9
23	5
24	10
25	20
26	27
27	11
28	19
29	9
30	18
31	36
32	25
33	29
34	27
35	5
36	10
37	20
38	40
39	61
40	13
41	21
42	42
43	29
44	27
45	39
46	9
47	17
48	29
49	58
50	49
51	27
52	25
53	50
54	11
55	22
56	44
57	39
58	11
59	22
60	44
61	29
62	58
63	116
64	53
65	19
66	38
67	76
68	152
69	237
70	139
71	5
72	10
73	20

n	a(n)
1	1
2	2
3	3
4	3
5	6
6	9
7	11
8	11
9	7
10	9
11	5
12	10
13	19
14	11
15	5
16	10
17	9
18	11
19	22
20	35
21	39
22	9
23	5
24	10
25	20
26	27
27	11
28	19
29	9
30	18
31	36
32	25
33	29
34	27
35	5
36	10
37	20
38	40
39	61
40	13
41	21
42	42
43	29
44	27
45	39
46	9
47	17
48	29
49	58
50	49
51	27
52	25
53	50
54	11
55	22
56	44
57	39
58	11
59	22
60	44
61	29
62	58
63	116
64	53
65	19
66	38
67	76
68	152
69	237
70	139
71	5
72	10
73	20