A330926 - cp's OEIS frontend

A330926 a(n) = Sum_{k=1..n} (ceiling(n/k) mod 2).

n	a(n)
1	1
2	1
3	2
4	1
5	3
6	2
7	3
8	2
9	5
10	3
11	4
12	3
13	6
14	5
15	6
16	3
17	7
18	6
19	7
20	6
21	9
22	6
23	7
24	6
25	11
26	9
27	10
28	7
29	10
30	9
31	10
32	9
33	14
34	11
35	12
36	9
37	13
38	12
39	13
40	10
41	15
42	14
43	15
44	14
45	17
46	12
47	13
48	12
49	19
50	17
51	18
52	15
53	18
54	17
55	18
56	15
57	20
58	17
59	18
60	17
61	22
62	21
63	22
64	17
65	23
66	20
67	21
68	20
69	23
70	20
71	21
72	20
73	27
74	26
75	27
76	22
77	25
78	22
79	23
80	22

[1, 1, 2, 1, 3, 2, 3, 2, 5, 3, 4, 3, 6, 5, 6, 3, 7, 6, 7, 6, 9, 6, 7, 6, 11, 9, 10, 7, 10, 9, 10, 9, 14, 11, 12, 9, 13, 12, 13, 10, 15, 14, 15, 14, 17, 12, 13, 12, 19, 17, 18, 15, 18, 17, 18, 15, 20, 17, 18, 17, 22, 21, 22, 17, 23, 20, 21, 20, 23, 20, 21, 20, 27, 26, 27, 22, 25, 22, 23, 22]

cp's OEIS Frontend

A330926 a(n) = Sum_{k=1..n} (ceiling(n/k) mod 2).

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	1
5	3
6	2
7	3
8	2
9	5
10	3
11	4
12	3
13	6
14	5
15	6
16	3
17	7
18	6
19	7
20	6
21	9
22	6
23	7
24	6
25	11
26	9
27	10
28	7
29	10
30	9
31	10
32	9
33	14
34	11
35	12
36	9
37	13
38	12
39	13
40	10
41	15
42	14
43	15
44	14
45	17
46	12
47	13
48	12
49	19
50	17
51	18
52	15
53	18
54	17
55	18
56	15
57	20
58	17
59	18
60	17
61	22
62	21
63	22
64	17
65	23
66	20
67	21
68	20
69	23
70	20
71	21
72	20
73	27
74	26
75	27
76	22
77	25
78	22
79	23
80	22

n	a(n)
1	1
2	1
3	2
4	1
5	3
6	2
7	3
8	2
9	5
10	3
11	4
12	3
13	6
14	5
15	6
16	3
17	7
18	6
19	7
20	6
21	9
22	6
23	7
24	6
25	11
26	9
27	10
28	7
29	10
30	9
31	10
32	9
33	14
34	11
35	12
36	9
37	13
38	12
39	13
40	10
41	15
42	14
43	15
44	14
45	17
46	12
47	13
48	12
49	19
50	17
51	18
52	15
53	18
54	17
55	18
56	15
57	20
58	17
59	18
60	17
61	22
62	21
63	22
64	17
65	23
66	20
67	21
68	20
69	23
70	20
71	21
72	20
73	27
74	26
75	27
76	22
77	25
78	22
79	23
80	22

n	a(n)
1	1
2	1
3	2
4	1
5	3
6	2
7	3
8	2
9	5
10	3
11	4
12	3
13	6
14	5
15	6
16	3
17	7
18	6
19	7
20	6
21	9
22	6
23	7
24	6
25	11
26	9
27	10
28	7
29	10
30	9
31	10
32	9
33	14
34	11
35	12
36	9
37	13
38	12
39	13
40	10
41	15
42	14
43	15
44	14
45	17
46	12
47	13
48	12
49	19
50	17
51	18
52	15
53	18
54	17
55	18
56	15
57	20
58	17
59	18
60	17
61	22
62	21
63	22
64	17
65	23
66	20
67	21
68	20
69	23
70	20
71	21
72	20
73	27
74	26
75	27
76	22
77	25
78	22
79	23
80	22