A091373 - cp's OEIS frontend

A091373 Number of numbers <= n having exactly as many prime factors as the value of their smallest prime factor.

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

[0, 0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 16, 16, 16, 16, 16, 16, 16, 17, 17]

cp's OEIS Frontend

A091373 Number of numbers <= n having exactly as many prime factors as the value of their smallest prime factor.

Table of values

List of values

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

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

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