A300428 - cp's OEIS frontend

A300428 a(n) is the least positive k such that the binary representation of n appears as a substring in the binary representation of 1/k (ignoring the radix point 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	5
10	3
11	11
12	5
13	11
14	9
15	17
16	1
17	9
18	7
19	5
20	11
21	3
22	13
23	11
24	9
25	5
26	11
27	13
28	9
29	11
30	17
31	33
32	1
33	17
34	11
35	9
36	7
37	19
38	5
39	13
40	11
41	29
42	3
43	19
44	13
45	27
46	11
47	19
48	17
49	9
50	19
51	5
52	11
53	19
54	13
55	29
56	9
57	19
58	11
59	13
60	17
61	25
62	33
63	65
64	1
65	33
66	23
67	17
68	13
69	11
70	29
71	9
72	23
73	7

[1, 1, 5, 1, 3, 5, 9, 1, 5, 3, 11, 5, 11, 9, 17, 1, 9, 7, 5, 11, 3, 13, 11, 9, 5, 11, 13, 9, 11, 17, 33, 1, 17, 11, 9, 7, 19, 5, 13, 11, 29, 3, 19, 13, 27, 11, 19, 17, 9, 19, 5, 11, 19, 13, 29, 9, 19, 11, 13, 17, 25, 33, 65, 1, 33, 23, 17, 13, 11, 29, 9, 23, 7]

cp's OEIS Frontend

A300428 a(n) is the least positive k such that the binary representation of n appears as a substring in the binary representation of 1/k (ignoring the radix point 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	5
10	3
11	11
12	5
13	11
14	9
15	17
16	1
17	9
18	7
19	5
20	11
21	3
22	13
23	11
24	9
25	5
26	11
27	13
28	9
29	11
30	17
31	33
32	1
33	17
34	11
35	9
36	7
37	19
38	5
39	13
40	11
41	29
42	3
43	19
44	13
45	27
46	11
47	19
48	17
49	9
50	19
51	5
52	11
53	19
54	13
55	29
56	9
57	19
58	11
59	13
60	17
61	25
62	33
63	65
64	1
65	33
66	23
67	17
68	13
69	11
70	29
71	9
72	23
73	7

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

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