A237879 - cp's OEIS frontend

A237879 Least positive integer k <= n such that the number of twin prime pairs not exceeding k*n is a square, or 0 if such a number k does not exist.

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	3
8	3
9	3
10	2
11	2
12	2
13	2
14	2
15	2
16	15
17	14
18	6
19	1
20	1
21	1
22	1
23	1
24	1
25	1
26	1
27	1
28	1
29	1
30	1
31	17
32	17
33	7
34	7
35	3
36	3
37	15
38	14
39	6
40	6
41	13
42	13
43	13
44	12
45	12
46	5
47	5
48	5
49	11
50	11
51	11
52	2
53	2
54	2
55	10
56	10
57	10
58	4
59	4
60	4
61	9
62	9
63	9
64	16
65	46
66	8
67	8
68	8
69	8
70	8
71	8
72	65
73	14
74	52
75	7
76	7
77	3
78	3
79	3
80	3

[1, 1, 1, 1, 1, 1, 3, 3, 3, 2, 2, 2, 2, 2, 2, 15, 14, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 7, 7, 3, 3, 15, 14, 6, 6, 13, 13, 13, 12, 12, 5, 5, 5, 11, 11, 11, 2, 2, 2, 10, 10, 10, 4, 4, 4, 9, 9, 9, 16, 46, 8, 8, 8, 8, 8, 8, 65, 14, 52, 7, 7, 3, 3, 3, 3]

cp's OEIS Frontend

A237879 Least positive integer k <= n such that the number of twin prime pairs not exceeding k*n is a square, or 0 if such a number k does not exist.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	3
8	3
9	3
10	2
11	2
12	2
13	2
14	2
15	2
16	15
17	14
18	6
19	1
20	1
21	1
22	1
23	1
24	1
25	1
26	1
27	1
28	1
29	1
30	1
31	17
32	17
33	7
34	7
35	3
36	3
37	15
38	14
39	6
40	6
41	13
42	13
43	13
44	12
45	12
46	5
47	5
48	5
49	11
50	11
51	11
52	2
53	2
54	2
55	10
56	10
57	10
58	4
59	4
60	4
61	9
62	9
63	9
64	16
65	46
66	8
67	8
68	8
69	8
70	8
71	8
72	65
73	14
74	52
75	7
76	7
77	3
78	3
79	3
80	3

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	3
8	3
9	3
10	2
11	2
12	2
13	2
14	2
15	2
16	15
17	14
18	6
19	1
20	1
21	1
22	1
23	1
24	1
25	1
26	1
27	1
28	1
29	1
30	1
31	17
32	17
33	7
34	7
35	3
36	3
37	15
38	14
39	6
40	6
41	13
42	13
43	13
44	12
45	12
46	5
47	5
48	5
49	11
50	11
51	11
52	2
53	2
54	2
55	10
56	10
57	10
58	4
59	4
60	4
61	9
62	9
63	9
64	16
65	46
66	8
67	8
68	8
69	8
70	8
71	8
72	65
73	14
74	52
75	7
76	7
77	3
78	3
79	3
80	3

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	3
8	3
9	3
10	2
11	2
12	2
13	2
14	2
15	2
16	15
17	14
18	6
19	1
20	1
21	1
22	1
23	1
24	1
25	1
26	1
27	1
28	1
29	1
30	1
31	17
32	17
33	7
34	7
35	3
36	3
37	15
38	14
39	6
40	6
41	13
42	13
43	13
44	12
45	12
46	5
47	5
48	5
49	11
50	11
51	11
52	2
53	2
54	2
55	10
56	10
57	10
58	4
59	4
60	4
61	9
62	9
63	9
64	16
65	46
66	8
67	8
68	8
69	8
70	8
71	8
72	65
73	14
74	52
75	7
76	7
77	3
78	3
79	3
80	3