A381405 - cp's OEIS frontend

A381405 a(0) = 0; for n > 0, a(n) is the smallest unused number such that a(n) AND a(n-1) = 0, where AND is the binary AND operation, while the binary weight of a(n) does not equal that of a(n-1).

n	a(n)
0	0
1	1
2	6
3	8
4	3
5	4
6	9
7	2
8	5
9	16
10	7
11	24
12	32
13	10
14	21
15	34
16	13
17	18
18	37
19	64
20	11
21	20
22	35
23	12
24	19
25	36
26	25
27	66
28	28
29	33
30	14
31	17
32	38
33	65
34	22
35	40
36	23
37	72
38	39
39	80
40	15
41	48
42	67
43	60
44	128
45	26
46	68
47	27
48	96
49	29
50	98
51	129
52	30
53	97
54	130
55	41
56	86
57	136
58	49
59	78
60	144
61	42
62	85
63	138
64	53
65	74
66	132
67	43
68	84
69	139
70	52
71	75
72	148
73	99
74	140
75	51
76	76
77	147
78	44
79	83
80	160
81	31
82	192
83	45
84	82
85	141
86	50
87	77
88	146
89	101

[0, 1, 6, 8, 3, 4, 9, 2, 5, 16, 7, 24, 32, 10, 21, 34, 13, 18, 37, 64, 11, 20, 35, 12, 19, 36, 25, 66, 28, 33, 14, 17, 38, 65, 22, 40, 23, 72, 39, 80, 15, 48, 67, 60, 128, 26, 68, 27, 96, 29, 98, 129, 30, 97, 130, 41, 86, 136, 49, 78, 144, 42, 85, 138, 53, 74, 132, 43, 84, 139, 52, 75, 148, 99, 140, 51, 76, 147, 44, 83, 160, 31, 192, 45, 82, 141, 50, 77, 146, 101]

cp's OEIS Frontend

A381405 a(0) = 0; for n > 0, a(n) is the smallest unused number such that a(n) AND a(n-1) = 0, where AND is the binary AND operation, while the binary weight of a(n) does not equal that of a(n-1).

Table of values

List of values

n	a(n)
0	0
1	1
2	6
3	8
4	3
5	4
6	9
7	2
8	5
9	16
10	7
11	24
12	32
13	10
14	21
15	34
16	13
17	18
18	37
19	64
20	11
21	20
22	35
23	12
24	19
25	36
26	25
27	66
28	28
29	33
30	14
31	17
32	38
33	65
34	22
35	40
36	23
37	72
38	39
39	80
40	15
41	48
42	67
43	60
44	128
45	26
46	68
47	27
48	96
49	29
50	98
51	129
52	30
53	97
54	130
55	41
56	86
57	136
58	49
59	78
60	144
61	42
62	85
63	138
64	53
65	74
66	132
67	43
68	84
69	139
70	52
71	75
72	148
73	99
74	140
75	51
76	76
77	147
78	44
79	83
80	160
81	31
82	192
83	45
84	82
85	141
86	50
87	77
88	146
89	101

n	a(n)
0	0
1	1
2	6
3	8
4	3
5	4
6	9
7	2
8	5
9	16
10	7
11	24
12	32
13	10
14	21
15	34
16	13
17	18
18	37
19	64
20	11
21	20
22	35
23	12
24	19
25	36
26	25
27	66
28	28
29	33
30	14
31	17
32	38
33	65
34	22
35	40
36	23
37	72
38	39
39	80
40	15
41	48
42	67
43	60
44	128
45	26
46	68
47	27
48	96
49	29
50	98
51	129
52	30
53	97
54	130
55	41
56	86
57	136
58	49
59	78
60	144
61	42
62	85
63	138
64	53
65	74
66	132
67	43
68	84
69	139
70	52
71	75
72	148
73	99
74	140
75	51
76	76
77	147
78	44
79	83
80	160
81	31
82	192
83	45
84	82
85	141
86	50
87	77
88	146
89	101

n	a(n)
0	0
1	1
2	6
3	8
4	3
5	4
6	9
7	2
8	5
9	16
10	7
11	24
12	32
13	10
14	21
15	34
16	13
17	18
18	37
19	64
20	11
21	20
22	35
23	12
24	19
25	36
26	25
27	66
28	28
29	33
30	14
31	17
32	38
33	65
34	22
35	40
36	23
37	72
38	39
39	80
40	15
41	48
42	67
43	60
44	128
45	26
46	68
47	27
48	96
49	29
50	98
51	129
52	30
53	97
54	130
55	41
56	86
57	136
58	49
59	78
60	144
61	42
62	85
63	138
64	53
65	74
66	132
67	43
68	84
69	139
70	52
71	75
72	148
73	99
74	140
75	51
76	76
77	147
78	44
79	83
80	160
81	31
82	192
83	45
84	82
85	141
86	50
87	77
88	146
89	101