A112411 - cp's OEIS frontend

A112411 a(n) = smallest positive integer, not occurring earlier in the sequence and not equal to n, that has the same number of (non-leading) 0's in its binary representation as n.

n	a(n)
1	3
2	5
3	1
4	9
5	2
6	11
7	15
8	17
9	4
10	12
11	6
12	10
13	14
14	13
15	7
16	33
17	8
18	20
19	21
20	18
21	19
22	25
23	27
24	35
25	22
26	28
27	23
28	26
29	30
30	29
31	63
32	65
33	16
34	36
35	24
36	34
37	38
38	37
39	43
40	48
41	42
42	41
43	39
44	49
45	46
46	45
47	55
48	40
49	44
50	52
51	53
52	50
53	51
54	57
55	47
56	71
57	54
58	60
59	61
60	58
61	59
62	95
63	31
64	129
65	32
66	68
67	69
68	66
69	67
70	73
71	56
72	80

[3, 5, 1, 9, 2, 11, 15, 17, 4, 12, 6, 10, 14, 13, 7, 33, 8, 20, 21, 18, 19, 25, 27, 35, 22, 28, 23, 26, 30, 29, 63, 65, 16, 36, 24, 34, 38, 37, 43, 48, 42, 41, 39, 49, 46, 45, 55, 40, 44, 52, 53, 50, 51, 57, 47, 71, 54, 60, 61, 58, 59, 95, 31, 129, 32, 68, 69, 66, 67, 73, 56, 80]

cp's OEIS Frontend

A112411 a(n) = smallest positive integer, not occurring earlier in the sequence and not equal to n, that has the same number of (non-leading) 0's in its binary representation as n.

Table of values

List of values

n	a(n)
1	3
2	5
3	1
4	9
5	2
6	11
7	15
8	17
9	4
10	12
11	6
12	10
13	14
14	13
15	7
16	33
17	8
18	20
19	21
20	18
21	19
22	25
23	27
24	35
25	22
26	28
27	23
28	26
29	30
30	29
31	63
32	65
33	16
34	36
35	24
36	34
37	38
38	37
39	43
40	48
41	42
42	41
43	39
44	49
45	46
46	45
47	55
48	40
49	44
50	52
51	53
52	50
53	51
54	57
55	47
56	71
57	54
58	60
59	61
60	58
61	59
62	95
63	31
64	129
65	32
66	68
67	69
68	66
69	67
70	73
71	56
72	80

n	a(n)
1	3
2	5
3	1
4	9
5	2
6	11
7	15
8	17
9	4
10	12
11	6
12	10
13	14
14	13
15	7
16	33
17	8
18	20
19	21
20	18
21	19
22	25
23	27
24	35
25	22
26	28
27	23
28	26
29	30
30	29
31	63
32	65
33	16
34	36
35	24
36	34
37	38
38	37
39	43
40	48
41	42
42	41
43	39
44	49
45	46
46	45
47	55
48	40
49	44
50	52
51	53
52	50
53	51
54	57
55	47
56	71
57	54
58	60
59	61
60	58
61	59
62	95
63	31
64	129
65	32
66	68
67	69
68	66
69	67
70	73
71	56
72	80

n	a(n)
1	3
2	5
3	1
4	9
5	2
6	11
7	15
8	17
9	4
10	12
11	6
12	10
13	14
14	13
15	7
16	33
17	8
18	20
19	21
20	18
21	19
22	25
23	27
24	35
25	22
26	28
27	23
28	26
29	30
30	29
31	63
32	65
33	16
34	36
35	24
36	34
37	38
38	37
39	43
40	48
41	42
42	41
43	39
44	49
45	46
46	45
47	55
48	40
49	44
50	52
51	53
52	50
53	51
54	57
55	47
56	71
57	54
58	60
59	61
60	58
61	59
62	95
63	31
64	129
65	32
66	68
67	69
68	66
69	67
70	73
71	56
72	80