A213883 - cp's OEIS frontend

A213883 Least number k such that (10^k-j)*10^n-1 is prime for some single-digit j or 0 if no such prime with 1<=k, 0<=j<=9 exists.

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

[1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 3, 2, 1, 1, 3, 5, 5, 3, 1, 3, 3, 1, 1, 9, 1, 1, 1, 1, 1, 7, 3, 6, 4, 1, 4, 4, 1, 15, 10, 1, 7, 3, 1, 3, 2, 2, 4, 6, 1, 3, 5, 20, 1, 1, 1, 8, 10, 7, 15, 10, 1, 4, 2, 5, 8, 3, 23, 11, 2, 2, 9, 3, 1, 5, 4, 1, 6, 3, 18, 2]

cp's OEIS Frontend

A213883 Least number k such that (10^k-j)*10^n-1 is prime for some single-digit j or 0 if no such prime with 1<=k, 0<=j<=9 exists.

Table of values

List of values

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

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

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