A043688 - cp's OEIS frontend

A043688 a(n) = (s(n)-1)/2, where s(n) is the n-th number whose base-2 representation has exactly 5 runs.

n	a(n)
1	10
2	18
3	20
4	21
5	22
6	26
7	34
8	36
9	37
10	38
11	40
12	41
13	43
14	44
15	45
16	46
17	50
18	52
19	53
20	54
21	58
22	66
23	68
24	69
25	70
26	72
27	73
28	75
29	76
30	77
31	78
32	80
33	81
34	83
35	87
36	88
37	89
38	91
39	92
40	93
41	94
42	98
43	100
44	101
45	102
46	104
47	105
48	107
49	108
50	109
51	110
52	114
53	116
54	117
55	118
56	122

[10, 18, 20, 21, 22, 26, 34, 36, 37, 38, 40, 41, 43, 44, 45, 46, 50, 52, 53, 54, 58, 66, 68, 69, 70, 72, 73, 75, 76, 77, 78, 80, 81, 83, 87, 88, 89, 91, 92, 93, 94, 98, 100, 101, 102, 104, 105, 107, 108, 109, 110, 114, 116, 117, 118, 122]

cp's OEIS Frontend

A043688 a(n) = (s(n)-1)/2, where s(n) is the n-th number whose base-2 representation has exactly 5 runs.

Table of values

List of values

n	a(n)
1	10
2	18
3	20
4	21
5	22
6	26
7	34
8	36
9	37
10	38
11	40
12	41
13	43
14	44
15	45
16	46
17	50
18	52
19	53
20	54
21	58
22	66
23	68
24	69
25	70
26	72
27	73
28	75
29	76
30	77
31	78
32	80
33	81
34	83
35	87
36	88
37	89
38	91
39	92
40	93
41	94
42	98
43	100
44	101
45	102
46	104
47	105
48	107
49	108
50	109
51	110
52	114
53	116
54	117
55	118
56	122

n	a(n)
1	10
2	18
3	20
4	21
5	22
6	26
7	34
8	36
9	37
10	38
11	40
12	41
13	43
14	44
15	45
16	46
17	50
18	52
19	53
20	54
21	58
22	66
23	68
24	69
25	70
26	72
27	73
28	75
29	76
30	77
31	78
32	80
33	81
34	83
35	87
36	88
37	89
38	91
39	92
40	93
41	94
42	98
43	100
44	101
45	102
46	104
47	105
48	107
49	108
50	109
51	110
52	114
53	116
54	117
55	118
56	122

n	a(n)
1	10
2	18
3	20
4	21
5	22
6	26
7	34
8	36
9	37
10	38
11	40
12	41
13	43
14	44
15	45
16	46
17	50
18	52
19	53
20	54
21	58
22	66
23	68
24	69
25	70
26	72
27	73
28	75
29	76
30	77
31	78
32	80
33	81
34	83
35	87
36	88
37	89
38	91
39	92
40	93
41	94
42	98
43	100
44	101
45	102
46	104
47	105
48	107
49	108
50	109
51	110
52	114
53	116
54	117
55	118
56	122