A381934 - cp's OEIS frontend

A381934 a(n) is the least k > 1 such that the binary expansions of n and n*k have the same number of nonleading zeros.

n	a(n)
0	2
1	3
2	3
3	5
4	3
5	6
6	5
7	9
8	3
9	5
10	6
11	5
12	5
13	19
14	9
15	17
16	3
17	5
18	5
19	3
20	6
21	9
22	5
23	11
24	5
25	7
26	19
27	301
28	9
29	35
30	17
31	33
32	3
33	5
34	5
35	3
36	5
37	5
38	3
39	3
40	6
41	5
42	9
43	5
44	5
45	17
46	11
47	305
48	5
49	7
50	7
51	15
52	19
53	3
54	301
55	9
56	9
57	71
58	35
59	13
60	17
61	67
62	33
63	65
64	3
65	5
66	5
67	3
68	5
69	5
70	3
71	3
72	5
73	10
74	5
75	10
76	3
77	6

[2, 3, 3, 5, 3, 6, 5, 9, 3, 5, 6, 5, 5, 19, 9, 17, 3, 5, 5, 3, 6, 9, 5, 11, 5, 7, 19, 301, 9, 35, 17, 33, 3, 5, 5, 3, 5, 5, 3, 3, 6, 5, 9, 5, 5, 17, 11, 305, 5, 7, 7, 15, 19, 3, 301, 9, 9, 71, 35, 13, 17, 67, 33, 65, 3, 5, 5, 3, 5, 5, 3, 3, 5, 10, 5, 10, 3, 6]

cp's OEIS Frontend

A381934 a(n) is the least k > 1 such that the binary expansions of n and n*k have the same number of nonleading zeros.

Table of values

List of values

n	a(n)
0	2
1	3
2	3
3	5
4	3
5	6
6	5
7	9
8	3
9	5
10	6
11	5
12	5
13	19
14	9
15	17
16	3
17	5
18	5
19	3
20	6
21	9
22	5
23	11
24	5
25	7
26	19
27	301
28	9
29	35
30	17
31	33
32	3
33	5
34	5
35	3
36	5
37	5
38	3
39	3
40	6
41	5
42	9
43	5
44	5
45	17
46	11
47	305
48	5
49	7
50	7
51	15
52	19
53	3
54	301
55	9
56	9
57	71
58	35
59	13
60	17
61	67
62	33
63	65
64	3
65	5
66	5
67	3
68	5
69	5
70	3
71	3
72	5
73	10
74	5
75	10
76	3
77	6

n	a(n)
0	2
1	3
2	3
3	5
4	3
5	6
6	5
7	9
8	3
9	5
10	6
11	5
12	5
13	19
14	9
15	17
16	3
17	5
18	5
19	3
20	6
21	9
22	5
23	11
24	5
25	7
26	19
27	301
28	9
29	35
30	17
31	33
32	3
33	5
34	5
35	3
36	5
37	5
38	3
39	3
40	6
41	5
42	9
43	5
44	5
45	17
46	11
47	305
48	5
49	7
50	7
51	15
52	19
53	3
54	301
55	9
56	9
57	71
58	35
59	13
60	17
61	67
62	33
63	65
64	3
65	5
66	5
67	3
68	5
69	5
70	3
71	3
72	5
73	10
74	5
75	10
76	3
77	6

n	a(n)
0	2
1	3
2	3
3	5
4	3
5	6
6	5
7	9
8	3
9	5
10	6
11	5
12	5
13	19
14	9
15	17
16	3
17	5
18	5
19	3
20	6
21	9
22	5
23	11
24	5
25	7
26	19
27	301
28	9
29	35
30	17
31	33
32	3
33	5
34	5
35	3
36	5
37	5
38	3
39	3
40	6
41	5
42	9
43	5
44	5
45	17
46	11
47	305
48	5
49	7
50	7
51	15
52	19
53	3
54	301
55	9
56	9
57	71
58	35
59	13
60	17
61	67
62	33
63	65
64	3
65	5
66	5
67	3
68	5
69	5
70	3
71	3
72	5
73	10
74	5
75	10
76	3
77	6