A066490 - cp's OEIS frontend

A066490 Number of primes of the form 4m+3 that are <= n.

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

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

cp's OEIS Frontend

A066490 Number of primes of the form 4m+3 that are <= n.

Table of values

List of values

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

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

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