A238573 - cp's OEIS frontend

A238573 a(n) = |{0 < k <= n: prime(k*n) + 2 is prime}|.

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

[0, 1, 1, 0, 3, 0, 4, 1, 2, 3, 1, 3, 4, 4, 4, 4, 1, 3, 6, 5, 3, 3, 4, 6, 3, 8, 5, 6, 3, 4, 2, 10, 6, 5, 7, 8, 6, 8, 7, 5, 7, 5, 11, 7, 7, 8, 8, 11, 6, 5, 7, 11, 11, 7, 4, 9, 7, 3, 5, 7, 7, 11, 8, 13, 9, 8, 7, 7, 12, 10, 8, 11, 8, 15, 8, 9, 9, 15, 13, 4]

cp's OEIS Frontend

A238573 a(n) = |{0 < k <= n: prime(k*n) + 2 is prime}|.

Table of values

List of values

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

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

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