A300475 - cp's OEIS frontend

A300475 a(n) is the least positive k such that the binary representation n appears in front of the binary representation of 1/k (ignoring the radix point and the leading zeros and adding trailing zeros if necessary in case of a terminating expansion).

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

[1, 1, 5, 1, 3, 5, 9, 1, 7, 3, 11, 5, 19, 9, 17, 1, 15, 7, 13, 25, 3, 23, 11, 21, 5, 19, 37, 9, 35, 17, 33, 1, 31, 15, 29, 7, 27, 53, 13, 25, 49, 3, 47, 23, 45, 11, 43, 21, 41, 81, 5, 39, 19, 75, 37, 9, 71, 35, 69, 17, 67, 33, 65, 1, 63, 31, 61, 15, 59, 29, 57]

cp's OEIS Frontend

A300475 a(n) is the least positive k such that the binary representation n appears in front of the binary representation of 1/k (ignoring the radix point and the leading zeros and adding trailing zeros if necessary in case of a terminating expansion).

Table of values

List of values

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

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

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