A248517 - cp's OEIS frontend

A248517 Number of odd divisors > 1 in the numbers 1 through n, counted with multiplicity.

n	a(n)
0	0
1	0
2	0
3	1
4	1
5	2
6	3
7	4
8	4
9	6
10	7
11	8
12	9
13	10
14	11
15	14
16	14
17	15
18	17
19	18
20	19
21	22
22	23
23	24
24	25
25	27
26	28
27	31
28	32
29	33
30	36
31	37
32	37
33	40
34	41
35	44
36	46
37	47
38	48
39	51
40	52
41	53
42	56
43	57
44	58
45	63
46	64
47	65
48	66
49	68
50	70
51	73
52	74
53	75
54	78
55	81
56	82
57	85
58	86
59	87
60	90
61	91
62	92
63	97
64	97
65	100
66	103
67	104
68	105
69	108
70	111

[0, 0, 0, 1, 1, 2, 3, 4, 4, 6, 7, 8, 9, 10, 11, 14, 14, 15, 17, 18, 19, 22, 23, 24, 25, 27, 28, 31, 32, 33, 36, 37, 37, 40, 41, 44, 46, 47, 48, 51, 52, 53, 56, 57, 58, 63, 64, 65, 66, 68, 70, 73, 74, 75, 78, 81, 82, 85, 86, 87, 90, 91, 92, 97, 97, 100, 103, 104, 105, 108, 111]

cp's OEIS Frontend

A248517 Number of odd divisors > 1 in the numbers 1 through n, counted with multiplicity.

Table of values

List of values

n	a(n)
0	0
1	0
2	0
3	1
4	1
5	2
6	3
7	4
8	4
9	6
10	7
11	8
12	9
13	10
14	11
15	14
16	14
17	15
18	17
19	18
20	19
21	22
22	23
23	24
24	25
25	27
26	28
27	31
28	32
29	33
30	36
31	37
32	37
33	40
34	41
35	44
36	46
37	47
38	48
39	51
40	52
41	53
42	56
43	57
44	58
45	63
46	64
47	65
48	66
49	68
50	70
51	73
52	74
53	75
54	78
55	81
56	82
57	85
58	86
59	87
60	90
61	91
62	92
63	97
64	97
65	100
66	103
67	104
68	105
69	108
70	111

n	a(n)
0	0
1	0
2	0
3	1
4	1
5	2
6	3
7	4
8	4
9	6
10	7
11	8
12	9
13	10
14	11
15	14
16	14
17	15
18	17
19	18
20	19
21	22
22	23
23	24
24	25
25	27
26	28
27	31
28	32
29	33
30	36
31	37
32	37
33	40
34	41
35	44
36	46
37	47
38	48
39	51
40	52
41	53
42	56
43	57
44	58
45	63
46	64
47	65
48	66
49	68
50	70
51	73
52	74
53	75
54	78
55	81
56	82
57	85
58	86
59	87
60	90
61	91
62	92
63	97
64	97
65	100
66	103
67	104
68	105
69	108
70	111

n	a(n)
0	0
1	0
2	0
3	1
4	1
5	2
6	3
7	4
8	4
9	6
10	7
11	8
12	9
13	10
14	11
15	14
16	14
17	15
18	17
19	18
20	19
21	22
22	23
23	24
24	25
25	27
26	28
27	31
28	32
29	33
30	36
31	37
32	37
33	40
34	41
35	44
36	46
37	47
38	48
39	51
40	52
41	53
42	56
43	57
44	58
45	63
46	64
47	65
48	66
49	68
50	70
51	73
52	74
53	75
54	78
55	81
56	82
57	85
58	86
59	87
60	90
61	91
62	92
63	97
64	97
65	100
66	103
67	104
68	105
69	108
70	111