A099801 - cp's OEIS frontend

A099801 PrimePi(2n+1), the number of primes less than or equal to 2n+1.

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

[0, 2, 3, 4, 4, 5, 6, 6, 7, 8, 8, 9, 9, 9, 10, 11, 11, 11, 12, 12, 13, 14, 14, 15, 15, 15, 16, 16, 16, 17, 18, 18, 18, 19, 19, 20, 21, 21, 21, 22, 22, 23, 23, 23, 24, 24, 24, 24, 25, 25, 26, 27, 27, 28, 29, 29, 30, 30, 30, 30, 30, 30, 30, 31, 31, 32, 32, 32, 33, 34, 34, 34, 34, 34]

cp's OEIS Frontend

A099801 PrimePi(2n+1), the number of primes less than or equal to 2n+1.

Table of values

List of values

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

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

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