A241018 - cp's OEIS frontend

A241018 a(n) is the smallest j such that the n-digit number consisting of a 1 in position j and 9's in the other n-1 positions is a prime, or 0 if no such prime exists.

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

[1, 1, 1, 5, 1, 7, 1, 0, 2, 6, 3, 3, 11, 2, 14, 4, 0, 4, 6, 0, 4, 20, 6, 7, 18, 1, 1, 23, 8, 8, 23, 7, 0, 0, 0, 26, 33, 0, 11, 8, 5, 8, 13, 12, 44, 2, 2, 0, 11, 31, 17, 39, 1, 51, 5, 7, 4, 29, 9, 16, 0, 0, 26, 14, 26, 10, 13, 0, 0, 34, 40, 0, 15, 3, 14, 32, 0]

cp's OEIS Frontend

A241018 a(n) is the smallest j such that the n-digit number consisting of a 1 in position j and 9's in the other n-1 positions is a prime, or 0 if no such prime exists.

Table of values

List of values

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

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

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