A221490 - cp's OEIS frontend

A221490 Number of primes of the form k*n + k - n, 1 <= k <= n.

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

[0, 0, 1, 1, 3, 1, 2, 2, 5, 3, 6, 3, 5, 4, 4, 3, 9, 2, 6, 5, 8, 4, 9, 4, 9, 7, 10, 4, 17, 3, 10, 9, 11, 9, 15, 4, 9, 10, 13, 5, 20, 7, 11, 10, 16, 8, 19, 6, 18, 12, 17, 5, 23, 9, 18, 9, 15, 8, 26, 7, 15, 12, 16, 13, 29, 8, 18, 13, 26, 9, 25, 10, 19, 18, 16]

cp's OEIS Frontend

A221490 Number of primes of the form k*n + k - n, 1 <= k <= n.

Table of values

List of values

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

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

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