A162309 - cp's OEIS frontend

A162309 a(n) is the number of isolated primes up to the smaller component of the n-th twin prime pair.

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	3
7	5
8	6
9	10
10	10
11	13
12	13
13	17
14	17
15	17
16	19
17	20
18	23
19	24
20	26
21	29
22	39
23	39
24	43
25	50
26	54
27	57
28	59
29	60
30	62
31	80
32	80
33	80
34	82
35	84
36	101
37	101
38	102
39	102
40	104
41	110
42	119
43	122
44	123
45	124
46	125
47	133
48	136
49	138
50	138
51	153
52	154
53	158
54	159
55	160
56	167
57	174
58	174
59	178
60	178
61	182
62	185
63	189
64	189

[1, 1, 1, 1, 2, 3, 5, 6, 10, 10, 13, 13, 17, 17, 17, 19, 20, 23, 24, 26, 29, 39, 39, 43, 50, 54, 57, 59, 60, 62, 80, 80, 80, 82, 84, 101, 101, 102, 102, 104, 110, 119, 122, 123, 124, 125, 133, 136, 138, 138, 153, 154, 158, 159, 160, 167, 174, 174, 178, 178, 182, 185, 189, 189]

cp's OEIS Frontend

A162309 a(n) is the number of isolated primes up to the smaller component of the n-th twin prime pair.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	3
7	5
8	6
9	10
10	10
11	13
12	13
13	17
14	17
15	17
16	19
17	20
18	23
19	24
20	26
21	29
22	39
23	39
24	43
25	50
26	54
27	57
28	59
29	60
30	62
31	80
32	80
33	80
34	82
35	84
36	101
37	101
38	102
39	102
40	104
41	110
42	119
43	122
44	123
45	124
46	125
47	133
48	136
49	138
50	138
51	153
52	154
53	158
54	159
55	160
56	167
57	174
58	174
59	178
60	178
61	182
62	185
63	189
64	189

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	3
7	5
8	6
9	10
10	10
11	13
12	13
13	17
14	17
15	17
16	19
17	20
18	23
19	24
20	26
21	29
22	39
23	39
24	43
25	50
26	54
27	57
28	59
29	60
30	62
31	80
32	80
33	80
34	82
35	84
36	101
37	101
38	102
39	102
40	104
41	110
42	119
43	122
44	123
45	124
46	125
47	133
48	136
49	138
50	138
51	153
52	154
53	158
54	159
55	160
56	167
57	174
58	174
59	178
60	178
61	182
62	185
63	189
64	189

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	3
7	5
8	6
9	10
10	10
11	13
12	13
13	17
14	17
15	17
16	19
17	20
18	23
19	24
20	26
21	29
22	39
23	39
24	43
25	50
26	54
27	57
28	59
29	60
30	62
31	80
32	80
33	80
34	82
35	84
36	101
37	101
38	102
39	102
40	104
41	110
42	119
43	122
44	123
45	124
46	125
47	133
48	136
49	138
50	138
51	153
52	154
53	158
54	159
55	160
56	167
57	174
58	174
59	178
60	178
61	182
62	185
63	189
64	189