A275495 - cp's OEIS frontend

A275495 a(n) = Sum_{k=2..n} floor(n/k) - 2floor(n/(2k)).

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

[0, 1, 2, 2, 3, 4, 5, 4, 6, 7, 8, 7, 8, 9, 12, 10, 11, 12, 13, 12, 15, 16, 17, 14, 16, 17, 20, 19, 20, 21, 22, 19, 22, 23, 26, 24, 25, 26, 29, 26, 27, 28, 29, 28, 33, 34, 35, 30, 32, 33, 36, 35, 36, 37, 40, 37, 40, 41, 42, 39, 40, 41, 46, 42, 45, 46, 47, 46, 49]

cp's OEIS Frontend

A275495 a(n) = Sum_{k=2..n} floor(n/k) - 2floor(n/(2k)).

Table of values

List of values

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

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

cp's OEIS Frontend

A275495 a(n) = Sum_{k=2..n} floor(n/k) - 2*floor(n/(2*k)).

Table of values

List of values

A275495 a(n) = Sum_{k=2..n} floor(n/k) - 2floor(n/(2k)).

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