A005187 - cp's OEIS frontend

A005187 a(n) = a(floor(n/2)) + n; also denominators in expansion of 1/sqrt(1-x) are 2^a(n); also 2n - number of 1's in binary expansion of 2n.

n	a(n)
0	0
1	1
2	3
3	4
4	7
5	8
6	10
7	11
8	15
9	16
10	18
11	19
12	22
13	23
14	25
15	26
16	31
17	32
18	34
19	35
20	38
21	39
22	41
23	42
24	46
25	47
26	49
27	50
28	53
29	54
30	56
31	57
32	63
33	64
34	66
35	67
36	70
37	71
38	73
39	74
40	78
41	79
42	81
43	82
44	85
45	86
46	88
47	89
48	94
49	95
50	97
51	98
52	101
53	102
54	104
55	105
56	109
57	110
58	112
59	113
60	116
61	117
62	119
63	120
64	127
65	128

[0, 1, 3, 4, 7, 8, 10, 11, 15, 16, 18, 19, 22, 23, 25, 26, 31, 32, 34, 35, 38, 39, 41, 42, 46, 47, 49, 50, 53, 54, 56, 57, 63, 64, 66, 67, 70, 71, 73, 74, 78, 79, 81, 82, 85, 86, 88, 89, 94, 95, 97, 98, 101, 102, 104, 105, 109, 110, 112, 113, 116, 117, 119, 120, 127, 128]

cp's OEIS Frontend

A005187 a(n) = a(floor(n/2)) + n; also denominators in expansion of 1/sqrt(1-x) are 2^a(n); also 2n - number of 1's in binary expansion of 2n.

Table of values

List of values

n	a(n)
0	0
1	1
2	3
3	4
4	7
5	8
6	10
7	11
8	15
9	16
10	18
11	19
12	22
13	23
14	25
15	26
16	31
17	32
18	34
19	35
20	38
21	39
22	41
23	42
24	46
25	47
26	49
27	50
28	53
29	54
30	56
31	57
32	63
33	64
34	66
35	67
36	70
37	71
38	73
39	74
40	78
41	79
42	81
43	82
44	85
45	86
46	88
47	89
48	94
49	95
50	97
51	98
52	101
53	102
54	104
55	105
56	109
57	110
58	112
59	113
60	116
61	117
62	119
63	120
64	127
65	128

n	a(n)
0	0
1	1
2	3
3	4
4	7
5	8
6	10
7	11
8	15
9	16
10	18
11	19
12	22
13	23
14	25
15	26
16	31
17	32
18	34
19	35
20	38
21	39
22	41
23	42
24	46
25	47
26	49
27	50
28	53
29	54
30	56
31	57
32	63
33	64
34	66
35	67
36	70
37	71
38	73
39	74
40	78
41	79
42	81
43	82
44	85
45	86
46	88
47	89
48	94
49	95
50	97
51	98
52	101
53	102
54	104
55	105
56	109
57	110
58	112
59	113
60	116
61	117
62	119
63	120
64	127
65	128

n	a(n)
0	0
1	1
2	3
3	4
4	7
5	8
6	10
7	11
8	15
9	16
10	18
11	19
12	22
13	23
14	25
15	26
16	31
17	32
18	34
19	35
20	38
21	39
22	41
23	42
24	46
25	47
26	49
27	50
28	53
29	54
30	56
31	57
32	63
33	64
34	66
35	67
36	70
37	71
38	73
39	74
40	78
41	79
42	81
43	82
44	85
45	86
46	88
47	89
48	94
49	95
50	97
51	98
52	101
53	102
54	104
55	105
56	109
57	110
58	112
59	113
60	116
61	117
62	119
63	120
64	127
65	128