A161399 - cp's OEIS frontend

A161399 a(n) = the smallest divisor of n that contains the same number of (non-leading) 0's as n when both numbers are written in binary.

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

[1, 2, 1, 4, 5, 2, 1, 8, 9, 10, 11, 4, 13, 2, 1, 16, 17, 18, 19, 20, 21, 22, 23, 8, 25, 26, 27, 4, 29, 2, 1, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 9, 46, 47, 16, 49, 50, 51, 52, 53, 9, 5, 8, 19, 58, 59, 4, 61, 2, 1, 64, 65, 66, 67, 68, 69, 70, 71]

cp's OEIS Frontend

A161399 a(n) = the smallest divisor of n that contains the same number of (non-leading) 0's as n when both numbers are written in binary.

Table of values

List of values

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

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

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