A238645 - cp's OEIS frontend

A238645 Number of odd primes p < 2n such that the number of squarefree numbers among 1, ..., ((p-1)/2)n is prime.

n	a(n)
1	0
2	1
3	2
4	1
5	2
6	2
7	1
8	2
9	2
10	5
11	2
12	3
13	3
14	1
15	6
16	5
17	3
18	3
19	1
20	4
21	2
22	4
23	4
24	3
25	4
26	2
27	4
28	3
29	1
30	4
31	3
32	3
33	7
34	5
35	4
36	5
37	5
38	4
39	3
40	2
41	5
42	2
43	2
44	4
45	5
46	4
47	9
48	7
49	4
50	3
51	2
52	4
53	3
54	4
55	3
56	2
57	4
58	6
59	5
60	6
61	4
62	4
63	2
64	2
65	7
66	5
67	6
68	6
69	8
70	3
71	7
72	3
73	5
74	6
75	10
76	6
77	6
78	6
79	4
80	5

[0, 1, 2, 1, 2, 2, 1, 2, 2, 5, 2, 3, 3, 1, 6, 5, 3, 3, 1, 4, 2, 4, 4, 3, 4, 2, 4, 3, 1, 4, 3, 3, 7, 5, 4, 5, 5, 4, 3, 2, 5, 2, 2, 4, 5, 4, 9, 7, 4, 3, 2, 4, 3, 4, 3, 2, 4, 6, 5, 6, 4, 4, 2, 2, 7, 5, 6, 6, 8, 3, 7, 3, 5, 6, 10, 6, 6, 6, 4, 5]

cp's OEIS Frontend

A238645 Number of odd primes p < 2n such that the number of squarefree numbers among 1, ..., ((p-1)/2)n is prime.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	1
5	2
6	2
7	1
8	2
9	2
10	5
11	2
12	3
13	3
14	1
15	6
16	5
17	3
18	3
19	1
20	4
21	2
22	4
23	4
24	3
25	4
26	2
27	4
28	3
29	1
30	4
31	3
32	3
33	7
34	5
35	4
36	5
37	5
38	4
39	3
40	2
41	5
42	2
43	2
44	4
45	5
46	4
47	9
48	7
49	4
50	3
51	2
52	4
53	3
54	4
55	3
56	2
57	4
58	6
59	5
60	6
61	4
62	4
63	2
64	2
65	7
66	5
67	6
68	6
69	8
70	3
71	7
72	3
73	5
74	6
75	10
76	6
77	6
78	6
79	4
80	5

n	a(n)
1	0
2	1
3	2
4	1
5	2
6	2
7	1
8	2
9	2
10	5
11	2
12	3
13	3
14	1
15	6
16	5
17	3
18	3
19	1
20	4
21	2
22	4
23	4
24	3
25	4
26	2
27	4
28	3
29	1
30	4
31	3
32	3
33	7
34	5
35	4
36	5
37	5
38	4
39	3
40	2
41	5
42	2
43	2
44	4
45	5
46	4
47	9
48	7
49	4
50	3
51	2
52	4
53	3
54	4
55	3
56	2
57	4
58	6
59	5
60	6
61	4
62	4
63	2
64	2
65	7
66	5
67	6
68	6
69	8
70	3
71	7
72	3
73	5
74	6
75	10
76	6
77	6
78	6
79	4
80	5

cp's OEIS Frontend

A238645 Number of odd primes p < 2*n such that the number of squarefree numbers among 1, ..., ((p-1)/2)*n is prime.

Table of values

List of values

A238645 Number of odd primes p < 2n such that the number of squarefree numbers among 1, ..., ((p-1)/2)n is prime.

n	a(n)
1	0
2	1
3	2
4	1
5	2
6	2
7	1
8	2
9	2
10	5
11	2
12	3
13	3
14	1
15	6
16	5
17	3
18	3
19	1
20	4
21	2
22	4
23	4
24	3
25	4
26	2
27	4
28	3
29	1
30	4
31	3
32	3
33	7
34	5
35	4
36	5
37	5
38	4
39	3
40	2
41	5
42	2
43	2
44	4
45	5
46	4
47	9
48	7
49	4
50	3
51	2
52	4
53	3
54	4
55	3
56	2
57	4
58	6
59	5
60	6
61	4
62	4
63	2
64	2
65	7
66	5
67	6
68	6
69	8
70	3
71	7
72	3
73	5
74	6
75	10
76	6
77	6
78	6
79	4
80	5