A062298 - cp's OEIS frontend

A062298 Number of nonprimes <= n.

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

[1, 1, 1, 2, 2, 3, 3, 4, 5, 6, 6, 7, 7, 8, 9, 10, 10, 11, 11, 12, 13, 14, 14, 15, 16, 17, 18, 19, 19, 20, 20, 21, 22, 23, 24, 25, 25, 26, 27, 28, 28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 42, 43, 43, 44, 45, 46, 47, 48, 48, 49, 50, 51, 51, 52, 52, 53]

cp's OEIS Frontend

A062298 Number of nonprimes <= n.

Table of values

List of values

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

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

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