A271497 - cp's OEIS frontend

A271497 If n is a multiple of 3 then a(n) = n/3, otherwise a(n) = n'+n'', where n' (resp. n'') is obtained by sorting the bits of the binary expansion of n into increasing (resp. decreasing) order.

n	a(n)
0	0
1	2
2	3
3	1
4	5
5	9
6	2
7	14
8	9
9	3
10	15
11	21
12	4
13	21
14	21
15	5
16	17
17	27
18	6
19	35
20	27
21	7
22	35
23	45
24	8
25	35
26	35
27	9
28	35
29	45
30	10
31	62
32	33
33	11
34	51
35	63
36	12
37	63
38	63
39	13
40	51
41	63
42	14
43	75
44	63
45	15
46	75
47	93
48	16
49	63
50	63
51	17
52	63
53	75
54	18
55	93
56	63
57	19
58	75
59	93
60	20
61	93
62	93
63	21
64	65
65	99
66	22
67	119
68	99
69	23
70	119
71	135
72	24
73	119
74	119
75	25
76	119
77	135

[0, 2, 3, 1, 5, 9, 2, 14, 9, 3, 15, 21, 4, 21, 21, 5, 17, 27, 6, 35, 27, 7, 35, 45, 8, 35, 35, 9, 35, 45, 10, 62, 33, 11, 51, 63, 12, 63, 63, 13, 51, 63, 14, 75, 63, 15, 75, 93, 16, 63, 63, 17, 63, 75, 18, 93, 63, 19, 75, 93, 20, 93, 93, 21, 65, 99, 22, 119, 99, 23, 119, 135, 24, 119, 119, 25, 119, 135]

cp's OEIS Frontend

A271497 If n is a multiple of 3 then a(n) = n/3, otherwise a(n) = n'+n'', where n' (resp. n'') is obtained by sorting the bits of the binary expansion of n into increasing (resp. decreasing) order.

Table of values

List of values

n	a(n)
0	0
1	2
2	3
3	1
4	5
5	9
6	2
7	14
8	9
9	3
10	15
11	21
12	4
13	21
14	21
15	5
16	17
17	27
18	6
19	35
20	27
21	7
22	35
23	45
24	8
25	35
26	35
27	9
28	35
29	45
30	10
31	62
32	33
33	11
34	51
35	63
36	12
37	63
38	63
39	13
40	51
41	63
42	14
43	75
44	63
45	15
46	75
47	93
48	16
49	63
50	63
51	17
52	63
53	75
54	18
55	93
56	63
57	19
58	75
59	93
60	20
61	93
62	93
63	21
64	65
65	99
66	22
67	119
68	99
69	23
70	119
71	135
72	24
73	119
74	119
75	25
76	119
77	135

n	a(n)
0	0
1	2
2	3
3	1
4	5
5	9
6	2
7	14
8	9
9	3
10	15
11	21
12	4
13	21
14	21
15	5
16	17
17	27
18	6
19	35
20	27
21	7
22	35
23	45
24	8
25	35
26	35
27	9
28	35
29	45
30	10
31	62
32	33
33	11
34	51
35	63
36	12
37	63
38	63
39	13
40	51
41	63
42	14
43	75
44	63
45	15
46	75
47	93
48	16
49	63
50	63
51	17
52	63
53	75
54	18
55	93
56	63
57	19
58	75
59	93
60	20
61	93
62	93
63	21
64	65
65	99
66	22
67	119
68	99
69	23
70	119
71	135
72	24
73	119
74	119
75	25
76	119
77	135

n	a(n)
0	0
1	2
2	3
3	1
4	5
5	9
6	2
7	14
8	9
9	3
10	15
11	21
12	4
13	21
14	21
15	5
16	17
17	27
18	6
19	35
20	27
21	7
22	35
23	45
24	8
25	35
26	35
27	9
28	35
29	45
30	10
31	62
32	33
33	11
34	51
35	63
36	12
37	63
38	63
39	13
40	51
41	63
42	14
43	75
44	63
45	15
46	75
47	93
48	16
49	63
50	63
51	17
52	63
53	75
54	18
55	93
56	63
57	19
58	75
59	93
60	20
61	93
62	93
63	21
64	65
65	99
66	22
67	119
68	99
69	23
70	119
71	135
72	24
73	119
74	119
75	25
76	119
77	135