A143738 - cp's OEIS frontend

A143738 Number of twin primes between n and n^2. Only smaller of twins (terms of A001359) are counted.

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	3
7	4
8	5
9	6
10	6
11	8
12	8
13	9
14	11
15	12
16	14
17	16
18	16
19	17
20	17
21	19
22	20
23	21
24	22
25	24
26	26
27	26
28	26
29	29
30	30
31	30
32	31
33	34
34	36
35	36
36	39
37	41
38	42
39	45
40	45
41	48
42	49
43	50
44	53
45	55
46	59
47	61
48	63
49	66
50	66
51	68
52	70
53	74
54	74
55	76
56	77
57	78
58	83
59	87
60	90
61	91
62	93
63	96
64	100

[0, 1, 2, 2, 3, 3, 4, 5, 6, 6, 8, 8, 9, 11, 12, 14, 16, 16, 17, 17, 19, 20, 21, 22, 24, 26, 26, 26, 29, 30, 30, 31, 34, 36, 36, 39, 41, 42, 45, 45, 48, 49, 50, 53, 55, 59, 61, 63, 66, 66, 68, 70, 74, 74, 76, 77, 78, 83, 87, 90, 91, 93, 96, 100]

cp's OEIS Frontend

A143738 Number of twin primes between n and n^2. Only smaller of twins (terms of A001359) are counted.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	3
7	4
8	5
9	6
10	6
11	8
12	8
13	9
14	11
15	12
16	14
17	16
18	16
19	17
20	17
21	19
22	20
23	21
24	22
25	24
26	26
27	26
28	26
29	29
30	30
31	30
32	31
33	34
34	36
35	36
36	39
37	41
38	42
39	45
40	45
41	48
42	49
43	50
44	53
45	55
46	59
47	61
48	63
49	66
50	66
51	68
52	70
53	74
54	74
55	76
56	77
57	78
58	83
59	87
60	90
61	91
62	93
63	96
64	100

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	3
7	4
8	5
9	6
10	6
11	8
12	8
13	9
14	11
15	12
16	14
17	16
18	16
19	17
20	17
21	19
22	20
23	21
24	22
25	24
26	26
27	26
28	26
29	29
30	30
31	30
32	31
33	34
34	36
35	36
36	39
37	41
38	42
39	45
40	45
41	48
42	49
43	50
44	53
45	55
46	59
47	61
48	63
49	66
50	66
51	68
52	70
53	74
54	74
55	76
56	77
57	78
58	83
59	87
60	90
61	91
62	93
63	96
64	100

n	a(n)
1	0
2	1
3	2
4	2
5	3
6	3
7	4
8	5
9	6
10	6
11	8
12	8
13	9
14	11
15	12
16	14
17	16
18	16
19	17
20	17
21	19
22	20
23	21
24	22
25	24
26	26
27	26
28	26
29	29
30	30
31	30
32	31
33	34
34	36
35	36
36	39
37	41
38	42
39	45
40	45
41	48
42	49
43	50
44	53
45	55
46	59
47	61
48	63
49	66
50	66
51	68
52	70
53	74
54	74
55	76
56	77
57	78
58	83
59	87
60	90
61	91
62	93
63	96
64	100