A210469 - cp's OEIS frontend

A210469 a(n) = n - primepi(2n).

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

[0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 4, 5, 5, 5, 6, 7, 7, 8, 8, 8, 9, 9, 10, 11, 11, 12, 13, 13, 13, 14, 15, 15, 16, 16, 16, 17, 18, 18, 19, 19, 20, 21, 21, 22, 23, 24, 24, 25, 25, 25, 26, 26, 26, 27, 27, 28, 29, 30, 31, 32, 33, 33, 34, 34, 35, 36, 36, 36]

cp's OEIS Frontend

A210469 a(n) = n - primepi(2n).

Table of values

List of values

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

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

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