A247648 - cp's OEIS frontend

A247648 Numbers whose binary expansion begins and ends with 1 and does not contain two adjacent zeros.

n	a(n)
1	1
2	3
3	5
4	7
5	11
6	13
7	15
8	21
9	23
10	27
11	29
12	31
13	43
14	45
15	47
16	53
17	55
18	59
19	61
20	63
21	85
22	87
23	91
24	93
25	95
26	107
27	109
28	111
29	117
30	119
31	123
32	125
33	127
34	171
35	173
36	175
37	181
38	183
39	187
40	189
41	191
42	213
43	215
44	219
45	221
46	223
47	235
48	237
49	239
50	245
51	247
52	251
53	253

[1, 3, 5, 7, 11, 13, 15, 21, 23, 27, 29, 31, 43, 45, 47, 53, 55, 59, 61, 63, 85, 87, 91, 93, 95, 107, 109, 111, 117, 119, 123, 125, 127, 171, 173, 175, 181, 183, 187, 189, 191, 213, 215, 219, 221, 223, 235, 237, 239, 245, 247, 251, 253]

cp's OEIS Frontend

A247648 Numbers whose binary expansion begins and ends with 1 and does not contain two adjacent zeros.

Table of values

List of values

n	a(n)
1	1
2	3
3	5
4	7
5	11
6	13
7	15
8	21
9	23
10	27
11	29
12	31
13	43
14	45
15	47
16	53
17	55
18	59
19	61
20	63
21	85
22	87
23	91
24	93
25	95
26	107
27	109
28	111
29	117
30	119
31	123
32	125
33	127
34	171
35	173
36	175
37	181
38	183
39	187
40	189
41	191
42	213
43	215
44	219
45	221
46	223
47	235
48	237
49	239
50	245
51	247
52	251
53	253

n	a(n)
1	1
2	3
3	5
4	7
5	11
6	13
7	15
8	21
9	23
10	27
11	29
12	31
13	43
14	45
15	47
16	53
17	55
18	59
19	61
20	63
21	85
22	87
23	91
24	93
25	95
26	107
27	109
28	111
29	117
30	119
31	123
32	125
33	127
34	171
35	173
36	175
37	181
38	183
39	187
40	189
41	191
42	213
43	215
44	219
45	221
46	223
47	235
48	237
49	239
50	245
51	247
52	251
53	253

n	a(n)
1	1
2	3
3	5
4	7
5	11
6	13
7	15
8	21
9	23
10	27
11	29
12	31
13	43
14	45
15	47
16	53
17	55
18	59
19	61
20	63
21	85
22	87
23	91
24	93
25	95
26	107
27	109
28	111
29	117
30	119
31	123
32	125
33	127
34	171
35	173
36	175
37	181
38	183
39	187
40	189
41	191
42	213
43	215
44	219
45	221
46	223
47	235
48	237
49	239
50	245
51	247
52	251
53	253