A175343 - cp's OEIS frontend

A175343 a(1)=1. a(n) = the smallest positive integer not yet occurring in the sequence such that (binary a(n)) OR (binary a(n-1)) is 2^k -1 for some k >=1.

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	5
7	6
8	9
9	14
10	11
11	12
12	15
13	8
14	23
15	10
16	13
17	18
18	29
19	19
20	28
21	27
22	20
23	31
24	16
25	47
26	17
27	30
28	21
29	26
30	37
31	58
32	39
33	24
34	55
35	25
36	22
37	41
38	54
39	43
40	52
41	59
42	36
43	63
44	32
45	95
46	33
47	62
48	35
49	60
50	51
51	44
52	83
53	45
54	50
55	61
56	34
57	93
58	38
59	57
60	46
61	49
62	78
63	53
64	42
65	85
66	106
67	87
68	40
69	119
70	56
71	71

[1, 2, 3, 4, 7, 5, 6, 9, 14, 11, 12, 15, 8, 23, 10, 13, 18, 29, 19, 28, 27, 20, 31, 16, 47, 17, 30, 21, 26, 37, 58, 39, 24, 55, 25, 22, 41, 54, 43, 52, 59, 36, 63, 32, 95, 33, 62, 35, 60, 51, 44, 83, 45, 50, 61, 34, 93, 38, 57, 46, 49, 78, 53, 42, 85, 106, 87, 40, 119, 56, 71]

cp's OEIS Frontend

A175343 a(1)=1. a(n) = the smallest positive integer not yet occurring in the sequence such that (binary a(n)) OR (binary a(n-1)) is 2^k -1 for some k >=1.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	5
7	6
8	9
9	14
10	11
11	12
12	15
13	8
14	23
15	10
16	13
17	18
18	29
19	19
20	28
21	27
22	20
23	31
24	16
25	47
26	17
27	30
28	21
29	26
30	37
31	58
32	39
33	24
34	55
35	25
36	22
37	41
38	54
39	43
40	52
41	59
42	36
43	63
44	32
45	95
46	33
47	62
48	35
49	60
50	51
51	44
52	83
53	45
54	50
55	61
56	34
57	93
58	38
59	57
60	46
61	49
62	78
63	53
64	42
65	85
66	106
67	87
68	40
69	119
70	56
71	71

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	5
7	6
8	9
9	14
10	11
11	12
12	15
13	8
14	23
15	10
16	13
17	18
18	29
19	19
20	28
21	27
22	20
23	31
24	16
25	47
26	17
27	30
28	21
29	26
30	37
31	58
32	39
33	24
34	55
35	25
36	22
37	41
38	54
39	43
40	52
41	59
42	36
43	63
44	32
45	95
46	33
47	62
48	35
49	60
50	51
51	44
52	83
53	45
54	50
55	61
56	34
57	93
58	38
59	57
60	46
61	49
62	78
63	53
64	42
65	85
66	106
67	87
68	40
69	119
70	56
71	71

n	a(n)
1	1
2	2
3	3
4	4
5	7
6	5
7	6
8	9
9	14
10	11
11	12
12	15
13	8
14	23
15	10
16	13
17	18
18	29
19	19
20	28
21	27
22	20
23	31
24	16
25	47
26	17
27	30
28	21
29	26
30	37
31	58
32	39
33	24
34	55
35	25
36	22
37	41
38	54
39	43
40	52
41	59
42	36
43	63
44	32
45	95
46	33
47	62
48	35
49	60
50	51
51	44
52	83
53	45
54	50
55	61
56	34
57	93
58	38
59	57
60	46
61	49
62	78
63	53
64	42
65	85
66	106
67	87
68	40
69	119
70	56
71	71