A238585 - cp's OEIS frontend

A238585 Number of primes p < n with prime(p)^2 + (prime(n)-1)^2 prime.

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

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

cp's OEIS Frontend

A238585 Number of primes p < n with prime(p)^2 + (prime(n)-1)^2 prime.

Table of values

List of values

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

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

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