A221491 - cp's OEIS frontend

A221491 Number of primes of the form k*n - k + n, 1 <= k <= n.

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

[0, 1, 2, 2, 2, 2, 5, 2, 3, 3, 5, 3, 6, 4, 7, 6, 5, 4, 9, 2, 8, 7, 8, 4, 11, 5, 10, 8, 10, 4, 16, 3, 10, 10, 12, 9, 15, 4, 10, 11, 13, 6, 20, 7, 11, 10, 15, 8, 19, 6, 19, 13, 16, 5, 25, 10, 19, 10, 15, 9, 26, 7, 16, 13, 16, 13, 30, 9, 18, 14, 26, 10, 25, 10]

cp's OEIS Frontend

A221491 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	1
3	2
4	2
5	2
6	2
7	5
8	2
9	3
10	3
11	5
12	3
13	6
14	4
15	7
16	6
17	5
18	4
19	9
20	2
21	8
22	7
23	8
24	4
25	11
26	5
27	10
28	8
29	10
30	4
31	16
32	3
33	10
34	10
35	12
36	9
37	15
38	4
39	10
40	11
41	13
42	6
43	20
44	7
45	11
46	10
47	15
48	8
49	19
50	6
51	19
52	13
53	16
54	5
55	25
56	10
57	19
58	10
59	15
60	9
61	26
62	7
63	16
64	13
65	16
66	13
67	30
68	9
69	18
70	14
71	26
72	10
73	25
74	10

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

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