A064557 - cp's OEIS frontend

A064557 a(n) = # { p | A064553(k) = p prime and k <= n}.

n	a(n)
1	0
2	1
3	2
4	2
5	2
6	2
7	3
8	3
9	3
10	3
11	3
12	3
13	4
14	4
15	4
16	4
17	4
18	4
19	4
20	4
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	4
29	5
30	5
31	5
32	5
33	5
34	5
35	5
36	5
37	6
38	6
39	6
40	6
41	6
42	6
43	6
44	6
45	6
46	6
47	6
48	6
49	6
50	6
51	6
52	6
53	7
54	7
55	7
56	7
57	7
58	7
59	7
60	7
61	8
62	8
63	8
64	8
65	8
66	8
67	8
68	8
69	8
70	8
71	8
72	8
73	8
74	8
75	8
76	8
77	8
78	8
79	9
80	9
81	9
82	9
83	9
84	9
85	9
86	9
87	9
88	9
89	9
90	9
91	9
92	9
93	9
94	9
95	9
96	9
97	9
98	9
99	9
100	9
101	9
102	9
103	9
104	9
105	9

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

cp's OEIS Frontend

A064557 a(n) = # { p | A064553(k) = p prime and k <= n}.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	2
5	2
6	2
7	3
8	3
9	3
10	3
11	3
12	3
13	4
14	4
15	4
16	4
17	4
18	4
19	4
20	4
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	4
29	5
30	5
31	5
32	5
33	5
34	5
35	5
36	5
37	6
38	6
39	6
40	6
41	6
42	6
43	6
44	6
45	6
46	6
47	6
48	6
49	6
50	6
51	6
52	6
53	7
54	7
55	7
56	7
57	7
58	7
59	7
60	7
61	8
62	8
63	8
64	8
65	8
66	8
67	8
68	8
69	8
70	8
71	8
72	8
73	8
74	8
75	8
76	8
77	8
78	8
79	9
80	9
81	9
82	9
83	9
84	9
85	9
86	9
87	9
88	9
89	9
90	9
91	9
92	9
93	9
94	9
95	9
96	9
97	9
98	9
99	9
100	9
101	9
102	9
103	9
104	9
105	9

n	a(n)
1	0
2	1
3	2
4	2
5	2
6	2
7	3
8	3
9	3
10	3
11	3
12	3
13	4
14	4
15	4
16	4
17	4
18	4
19	4
20	4
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	4
29	5
30	5
31	5
32	5
33	5
34	5
35	5
36	5
37	6
38	6
39	6
40	6
41	6
42	6
43	6
44	6
45	6
46	6
47	6
48	6
49	6
50	6
51	6
52	6
53	7
54	7
55	7
56	7
57	7
58	7
59	7
60	7
61	8
62	8
63	8
64	8
65	8
66	8
67	8
68	8
69	8
70	8
71	8
72	8
73	8
74	8
75	8
76	8
77	8
78	8
79	9
80	9
81	9
82	9
83	9
84	9
85	9
86	9
87	9
88	9
89	9
90	9
91	9
92	9
93	9
94	9
95	9
96	9
97	9
98	9
99	9
100	9
101	9
102	9
103	9
104	9
105	9

n	a(n)
1	0
2	1
3	2
4	2
5	2
6	2
7	3
8	3
9	3
10	3
11	3
12	3
13	4
14	4
15	4
16	4
17	4
18	4
19	4
20	4
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	4
29	5
30	5
31	5
32	5
33	5
34	5
35	5
36	5
37	6
38	6
39	6
40	6
41	6
42	6
43	6
44	6
45	6
46	6
47	6
48	6
49	6
50	6
51	6
52	6
53	7
54	7
55	7
56	7
57	7
58	7
59	7
60	7
61	8
62	8
63	8
64	8
65	8
66	8
67	8
68	8
69	8
70	8
71	8
72	8
73	8
74	8
75	8
76	8
77	8
78	8
79	9
80	9
81	9
82	9
83	9
84	9
85	9
86	9
87	9
88	9
89	9
90	9
91	9
92	9
93	9
94	9
95	9
96	9
97	9
98	9
99	9
100	9
101	9
102	9
103	9
104	9
105	9