A239579 - cp's OEIS frontend

A239579 a(n) = |{0 < k <= n: prime(prime(prime(k*n))) - 2 is prime}|.

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

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

cp's OEIS Frontend

A239579 a(n) = |{0 < k <= n: prime(prime(prime(k*n))) - 2 is prime}|.

Table of values

List of values

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

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

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