A080261 - cp's OEIS frontend

A080261 Simple involution of natural numbers: complement [binary_width(n)/2] least significant bits in the binary expansion of n.

n	a(n)
0	0
1	1
2	3
3	2
4	5
5	4
6	7
7	6
8	11
9	10
10	9
11	8
12	15
13	14
14	13
15	12
16	19
17	18
18	17
19	16
20	23
21	22
22	21
23	20
24	27
25	26
26	25
27	24
28	31
29	30
30	29
31	28
32	39
33	38
34	37
35	36
36	35
37	34
38	33
39	32
40	47
41	46
42	45
43	44
44	43
45	42
46	41
47	40
48	55
49	54
50	53
51	52
52	51
53	50
54	49
55	48
56	63
57	62
58	61
59	60
60	59
61	58
62	57
63	56
64	71
65	70
66	69
67	68
68	67
69	66
70	65
71	64
72	79

[0, 1, 3, 2, 5, 4, 7, 6, 11, 10, 9, 8, 15, 14, 13, 12, 19, 18, 17, 16, 23, 22, 21, 20, 27, 26, 25, 24, 31, 30, 29, 28, 39, 38, 37, 36, 35, 34, 33, 32, 47, 46, 45, 44, 43, 42, 41, 40, 55, 54, 53, 52, 51, 50, 49, 48, 63, 62, 61, 60, 59, 58, 57, 56, 71, 70, 69, 68, 67, 66, 65, 64, 79]

cp's OEIS Frontend

A080261 Simple involution of natural numbers: complement [binary_width(n)/2] least significant bits in the binary expansion of n.

Table of values

List of values

n	a(n)
0	0
1	1
2	3
3	2
4	5
5	4
6	7
7	6
8	11
9	10
10	9
11	8
12	15
13	14
14	13
15	12
16	19
17	18
18	17
19	16
20	23
21	22
22	21
23	20
24	27
25	26
26	25
27	24
28	31
29	30
30	29
31	28
32	39
33	38
34	37
35	36
36	35
37	34
38	33
39	32
40	47
41	46
42	45
43	44
44	43
45	42
46	41
47	40
48	55
49	54
50	53
51	52
52	51
53	50
54	49
55	48
56	63
57	62
58	61
59	60
60	59
61	58
62	57
63	56
64	71
65	70
66	69
67	68
68	67
69	66
70	65
71	64
72	79

n	a(n)
0	0
1	1
2	3
3	2
4	5
5	4
6	7
7	6
8	11
9	10
10	9
11	8
12	15
13	14
14	13
15	12
16	19
17	18
18	17
19	16
20	23
21	22
22	21
23	20
24	27
25	26
26	25
27	24
28	31
29	30
30	29
31	28
32	39
33	38
34	37
35	36
36	35
37	34
38	33
39	32
40	47
41	46
42	45
43	44
44	43
45	42
46	41
47	40
48	55
49	54
50	53
51	52
52	51
53	50
54	49
55	48
56	63
57	62
58	61
59	60
60	59
61	58
62	57
63	56
64	71
65	70
66	69
67	68
68	67
69	66
70	65
71	64
72	79

n	a(n)
0	0
1	1
2	3
3	2
4	5
5	4
6	7
7	6
8	11
9	10
10	9
11	8
12	15
13	14
14	13
15	12
16	19
17	18
18	17
19	16
20	23
21	22
22	21
23	20
24	27
25	26
26	25
27	24
28	31
29	30
30	29
31	28
32	39
33	38
34	37
35	36
36	35
37	34
38	33
39	32
40	47
41	46
42	45
43	44
44	43
45	42
46	41
47	40
48	55
49	54
50	53
51	52
52	51
53	50
54	49
55	48
56	63
57	62
58	61
59	60
60	59
61	58
62	57
63	56
64	71
65	70
66	69
67	68
68	67
69	66
70	65
71	64
72	79