A246593 - cp's OEIS frontend

A246593 a(n)=n for n <= 2; for n >= 3, a(n) = largest number that can be obtained by swapping two 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	12
10	12
11	14
12	12
13	14
14	14
15	15
16	16
17	24
18	24
19	26
20	24
21	28
22	28
23	30
24	24
25	28
26	28
27	30
28	28
29	30
30	30
31	31
32	32
33	48
34	48
35	50
36	48
37	52
38	52
39	54
40	48
41	56
42	56
43	58
44	56
45	60
46	60
47	62
48	48
49	56
50	56
51	58
52	56
53	60
54	60
55	62
56	56
57	60
58	60
59	62
60	60
61	62
62	62
63	63
64	64
65	96
66	96

[0, 1, 2, 3, 4, 6, 6, 7, 8, 12, 12, 14, 12, 14, 14, 15, 16, 24, 24, 26, 24, 28, 28, 30, 24, 28, 28, 30, 28, 30, 30, 31, 32, 48, 48, 50, 48, 52, 52, 54, 48, 56, 56, 58, 56, 60, 60, 62, 48, 56, 56, 58, 56, 60, 60, 62, 56, 60, 60, 62, 60, 62, 62, 63, 64, 96, 96]

cp's OEIS Frontend

A246593 a(n)=n for n <= 2; for n >= 3, a(n) = largest number that can be obtained by swapping two 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	12
10	12
11	14
12	12
13	14
14	14
15	15
16	16
17	24
18	24
19	26
20	24
21	28
22	28
23	30
24	24
25	28
26	28
27	30
28	28
29	30
30	30
31	31
32	32
33	48
34	48
35	50
36	48
37	52
38	52
39	54
40	48
41	56
42	56
43	58
44	56
45	60
46	60
47	62
48	48
49	56
50	56
51	58
52	56
53	60
54	60
55	62
56	56
57	60
58	60
59	62
60	60
61	62
62	62
63	63
64	64
65	96
66	96

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	6
6	6
7	7
8	8
9	12
10	12
11	14
12	12
13	14
14	14
15	15
16	16
17	24
18	24
19	26
20	24
21	28
22	28
23	30
24	24
25	28
26	28
27	30
28	28
29	30
30	30
31	31
32	32
33	48
34	48
35	50
36	48
37	52
38	52
39	54
40	48
41	56
42	56
43	58
44	56
45	60
46	60
47	62
48	48
49	56
50	56
51	58
52	56
53	60
54	60
55	62
56	56
57	60
58	60
59	62
60	60
61	62
62	62
63	63
64	64
65	96
66	96

n	a(n)
0	0
1	1
2	2
3	3
4	4
5	6
6	6
7	7
8	8
9	12
10	12
11	14
12	12
13	14
14	14
15	15
16	16
17	24
18	24
19	26
20	24
21	28
22	28
23	30
24	24
25	28
26	28
27	30
28	28
29	30
30	30
31	31
32	32
33	48
34	48
35	50
36	48
37	52
38	52
39	54
40	48
41	56
42	56
43	58
44	56
45	60
46	60
47	62
48	48
49	56
50	56
51	58
52	56
53	60
54	60
55	62
56	56
57	60
58	60
59	62
60	60
61	62
62	62
63	63
64	64
65	96
66	96