A072203 - cp's OEIS frontend

A072203 (Number of oddly factored numbers <= n) - (number of evenly factored numbers <= n).

n	a(n)
1	0
2	1
3	2
4	1
5	2
6	1
7	2
8	3
9	2
10	1
11	2
12	3
13	4
14	3
15	2
16	1
17	2
18	3
19	4
20	5
21	4
22	3
23	4
24	3
25	2
26	1
27	2
28	3
29	4
30	5
31	6
32	7
33	6
34	5
35	4
36	3
37	4
38	3
39	2
40	1
41	2
42	3
43	4
44	5
45	6
46	5
47	6
48	7
49	6
50	7
51	6
52	7
53	8
54	7
55	6
56	5
57	4
58	3
59	4
60	3
61	4
62	3
63	4
64	3
65	2
66	3
67	4
68	5
69	4
70	5
71	6
72	7
73	8
74	7
75	8
76	9
77	8
78	9
79	10
80	11
81	10
82	9
83	10
84	9
85	8
86	7
87	6
88	5
89	6
90	5
91	4
92	5
93	4
94	3
95	2
96	1
97	2
98	3
99	4
100	3
101	4
102	5
103	6

[0, 1, 2, 1, 2, 1, 2, 3, 2, 1, 2, 3, 4, 3, 2, 1, 2, 3, 4, 5, 4, 3, 4, 3, 2, 1, 2, 3, 4, 5, 6, 7, 6, 5, 4, 3, 4, 3, 2, 1, 2, 3, 4, 5, 6, 5, 6, 7, 6, 7, 6, 7, 8, 7, 6, 5, 4, 3, 4, 3, 4, 3, 4, 3, 2, 3, 4, 5, 4, 5, 6, 7, 8, 7, 8, 9, 8, 9, 10, 11, 10, 9, 10, 9, 8, 7, 6, 5, 6, 5, 4, 5, 4, 3, 2, 1, 2, 3, 4, 3, 4, 5, 6]

cp's OEIS Frontend

A072203 (Number of oddly factored numbers <= n) - (number of evenly factored numbers <= n).

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	1
5	2
6	1
7	2
8	3
9	2
10	1
11	2
12	3
13	4
14	3
15	2
16	1
17	2
18	3
19	4
20	5
21	4
22	3
23	4
24	3
25	2
26	1
27	2
28	3
29	4
30	5
31	6
32	7
33	6
34	5
35	4
36	3
37	4
38	3
39	2
40	1
41	2
42	3
43	4
44	5
45	6
46	5
47	6
48	7
49	6
50	7
51	6
52	7
53	8
54	7
55	6
56	5
57	4
58	3
59	4
60	3
61	4
62	3
63	4
64	3
65	2
66	3
67	4
68	5
69	4
70	5
71	6
72	7
73	8
74	7
75	8
76	9
77	8
78	9
79	10
80	11
81	10
82	9
83	10
84	9
85	8
86	7
87	6
88	5
89	6
90	5
91	4
92	5
93	4
94	3
95	2
96	1
97	2
98	3
99	4
100	3
101	4
102	5
103	6

n	a(n)
1	0
2	1
3	2
4	1
5	2
6	1
7	2
8	3
9	2
10	1
11	2
12	3
13	4
14	3
15	2
16	1
17	2
18	3
19	4
20	5
21	4
22	3
23	4
24	3
25	2
26	1
27	2
28	3
29	4
30	5
31	6
32	7
33	6
34	5
35	4
36	3
37	4
38	3
39	2
40	1
41	2
42	3
43	4
44	5
45	6
46	5
47	6
48	7
49	6
50	7
51	6
52	7
53	8
54	7
55	6
56	5
57	4
58	3
59	4
60	3
61	4
62	3
63	4
64	3
65	2
66	3
67	4
68	5
69	4
70	5
71	6
72	7
73	8
74	7
75	8
76	9
77	8
78	9
79	10
80	11
81	10
82	9
83	10
84	9
85	8
86	7
87	6
88	5
89	6
90	5
91	4
92	5
93	4
94	3
95	2
96	1
97	2
98	3
99	4
100	3
101	4
102	5
103	6

n	a(n)
1	0
2	1
3	2
4	1
5	2
6	1
7	2
8	3
9	2
10	1
11	2
12	3
13	4
14	3
15	2
16	1
17	2
18	3
19	4
20	5
21	4
22	3
23	4
24	3
25	2
26	1
27	2
28	3
29	4
30	5
31	6
32	7
33	6
34	5
35	4
36	3
37	4
38	3
39	2
40	1
41	2
42	3
43	4
44	5
45	6
46	5
47	6
48	7
49	6
50	7
51	6
52	7
53	8
54	7
55	6
56	5
57	4
58	3
59	4
60	3
61	4
62	3
63	4
64	3
65	2
66	3
67	4
68	5
69	4
70	5
71	6
72	7
73	8
74	7
75	8
76	9
77	8
78	9
79	10
80	11
81	10
82	9
83	10
84	9
85	8
86	7
87	6
88	5
89	6
90	5
91	4
92	5
93	4
94	3
95	2
96	1
97	2
98	3
99	4
100	3
101	4
102	5
103	6