A075311 - cp's OEIS frontend

A075311 a(1) = 1; for n > 1, a(n) is the smallest number m > a(n-1) such that the number of 1's in the binary expansion of m is not already in the sequence.

n	a(n)
1	1
2	3
3	5
4	6
5	9
6	10
7	12
8	15
9	17
10	18
11	20
12	23
13	24
14	27
15	29
16	30
17	33
18	34
19	36
20	39
21	40
22	43
23	45
24	46
25	48
26	51
27	53
28	54
29	57
30	58
31	60
32	65
33	66
34	68
35	71
36	72
37	75
38	77
39	78
40	80
41	83
42	85
43	86
44	89
45	90
46	92
47	96
48	99
49	101
50	102
51	105
52	106
53	108
54	113
55	114
56	116
57	120
58	127
59	129
60	130
61	132
62	135
63	136
64	139
65	141

[1, 3, 5, 6, 9, 10, 12, 15, 17, 18, 20, 23, 24, 27, 29, 30, 33, 34, 36, 39, 40, 43, 45, 46, 48, 51, 53, 54, 57, 58, 60, 65, 66, 68, 71, 72, 75, 77, 78, 80, 83, 85, 86, 89, 90, 92, 96, 99, 101, 102, 105, 106, 108, 113, 114, 116, 120, 127, 129, 130, 132, 135, 136, 139, 141]

cp's OEIS Frontend

A075311 a(1) = 1; for n > 1, a(n) is the smallest number m > a(n-1) such that the number of 1's in the binary expansion of m is not already in the sequence.

Table of values

List of values

n	a(n)
1	1
2	3
3	5
4	6
5	9
6	10
7	12
8	15
9	17
10	18
11	20
12	23
13	24
14	27
15	29
16	30
17	33
18	34
19	36
20	39
21	40
22	43
23	45
24	46
25	48
26	51
27	53
28	54
29	57
30	58
31	60
32	65
33	66
34	68
35	71
36	72
37	75
38	77
39	78
40	80
41	83
42	85
43	86
44	89
45	90
46	92
47	96
48	99
49	101
50	102
51	105
52	106
53	108
54	113
55	114
56	116
57	120
58	127
59	129
60	130
61	132
62	135
63	136
64	139
65	141

n	a(n)
1	1
2	3
3	5
4	6
5	9
6	10
7	12
8	15
9	17
10	18
11	20
12	23
13	24
14	27
15	29
16	30
17	33
18	34
19	36
20	39
21	40
22	43
23	45
24	46
25	48
26	51
27	53
28	54
29	57
30	58
31	60
32	65
33	66
34	68
35	71
36	72
37	75
38	77
39	78
40	80
41	83
42	85
43	86
44	89
45	90
46	92
47	96
48	99
49	101
50	102
51	105
52	106
53	108
54	113
55	114
56	116
57	120
58	127
59	129
60	130
61	132
62	135
63	136
64	139
65	141

n	a(n)
1	1
2	3
3	5
4	6
5	9
6	10
7	12
8	15
9	17
10	18
11	20
12	23
13	24
14	27
15	29
16	30
17	33
18	34
19	36
20	39
21	40
22	43
23	45
24	46
25	48
26	51
27	53
28	54
29	57
30	58
31	60
32	65
33	66
34	68
35	71
36	72
37	75
38	77
39	78
40	80
41	83
42	85
43	86
44	89
45	90
46	92
47	96
48	99
49	101
50	102
51	105
52	106
53	108
54	113
55	114
56	116
57	120
58	127
59	129
60	130
61	132
62	135
63	136
64	139
65	141