A246594 - cp's OEIS frontend

A246594 a(n)=n for n <= 2; for n >= 3, a(n) = largest number that can be obtained by swapping two adjacent bits in the binary expansion of n.

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

[0, 1, 2, 3, 4, 6, 6, 7, 8, 10, 12, 13, 12, 14, 14, 15, 16, 18, 20, 21, 24, 25, 26, 27, 24, 26, 28, 29, 28, 30, 30, 31, 32, 34, 36, 37, 40, 41, 42, 43, 48, 49, 50, 51, 52, 53, 54, 55, 48, 50, 52, 53, 56, 57, 58, 59, 56, 58, 60, 61, 60, 62, 62, 63, 64, 66, 68]

cp's OEIS Frontend

A246594 a(n)=n for n <= 2; for n >= 3, a(n) = largest number that can be obtained by swapping two adjacent bits in the binary expansion of n.

Table of values

List of values

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

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

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