A129768 - cp's OEIS frontend

A129768 Number of odd nonprime numbers less than the n-th prime.

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	2
7	3
8	3
9	4
10	6
11	6
12	8
13	9
14	9
15	10
16	12
17	14
18	14
19	16
20	17
21	17
22	19
23	20
24	22
25	25
26	26
27	26
28	27
29	27
30	28
31	34
32	35
33	37
34	37
35	41
36	41
37	43
38	45
39	46
40	48
41	50
42	50
43	54
44	54
45	55
46	55
47	60
48	65
49	66
50	66
51	67
52	69
53	69
54	73
55	75
56	77
57	79
58	79
59	81
60	82
61	82
62	86
63	92
64	93
65	93
66	94
67	100
68	102
69	106
70	106
71	107
72	109

[1, 1, 1, 1, 2, 2, 3, 3, 4, 6, 6, 8, 9, 9, 10, 12, 14, 14, 16, 17, 17, 19, 20, 22, 25, 26, 26, 27, 27, 28, 34, 35, 37, 37, 41, 41, 43, 45, 46, 48, 50, 50, 54, 54, 55, 55, 60, 65, 66, 66, 67, 69, 69, 73, 75, 77, 79, 79, 81, 82, 82, 86, 92, 93, 93, 94, 100, 102, 106, 106, 107, 109]

cp's OEIS Frontend

A129768 Number of odd nonprime numbers less than the n-th prime.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	2
7	3
8	3
9	4
10	6
11	6
12	8
13	9
14	9
15	10
16	12
17	14
18	14
19	16
20	17
21	17
22	19
23	20
24	22
25	25
26	26
27	26
28	27
29	27
30	28
31	34
32	35
33	37
34	37
35	41
36	41
37	43
38	45
39	46
40	48
41	50
42	50
43	54
44	54
45	55
46	55
47	60
48	65
49	66
50	66
51	67
52	69
53	69
54	73
55	75
56	77
57	79
58	79
59	81
60	82
61	82
62	86
63	92
64	93
65	93
66	94
67	100
68	102
69	106
70	106
71	107
72	109

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	2
7	3
8	3
9	4
10	6
11	6
12	8
13	9
14	9
15	10
16	12
17	14
18	14
19	16
20	17
21	17
22	19
23	20
24	22
25	25
26	26
27	26
28	27
29	27
30	28
31	34
32	35
33	37
34	37
35	41
36	41
37	43
38	45
39	46
40	48
41	50
42	50
43	54
44	54
45	55
46	55
47	60
48	65
49	66
50	66
51	67
52	69
53	69
54	73
55	75
56	77
57	79
58	79
59	81
60	82
61	82
62	86
63	92
64	93
65	93
66	94
67	100
68	102
69	106
70	106
71	107
72	109

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	2
7	3
8	3
9	4
10	6
11	6
12	8
13	9
14	9
15	10
16	12
17	14
18	14
19	16
20	17
21	17
22	19
23	20
24	22
25	25
26	26
27	26
28	27
29	27
30	28
31	34
32	35
33	37
34	37
35	41
36	41
37	43
38	45
39	46
40	48
41	50
42	50
43	54
44	54
45	55
46	55
47	60
48	65
49	66
50	66
51	67
52	69
53	69
54	73
55	75
56	77
57	79
58	79
59	81
60	82
61	82
62	86
63	92
64	93
65	93
66	94
67	100
68	102
69	106
70	106
71	107
72	109