A121172 - cp's OEIS frontend

A121172 Smallest integer k>0 such that k*10^n + 1 is a prime.

n	a(n)
1	1
2	1
3	3
4	7
5	7
6	22
7	3
8	6
9	6
10	3
11	19
12	18
13	4
14	39
15	6
16	13
17	37
18	15
19	15
20	6
21	16
22	9
23	96
24	61
25	19
26	6
27	9
28	3
29	33
30	63
31	57
32	117
33	55
34	49
35	30
36	3
37	28
38	6
39	42
40	24
41	36
42	72
43	21
44	60
45	6
46	24
47	33
48	61
49	21
50	85
51	31
52	49
53	13
54	93
55	18
56	90
57	9
58	16
59	135
60	19
61	55
62	9
63	135
64	60
65	6
66	30
67	3
68	16
69	115
70	114
71	19
72	99
73	15
74	147
75	171
76	42

[1, 1, 3, 7, 7, 22, 3, 6, 6, 3, 19, 18, 4, 39, 6, 13, 37, 15, 15, 6, 16, 9, 96, 61, 19, 6, 9, 3, 33, 63, 57, 117, 55, 49, 30, 3, 28, 6, 42, 24, 36, 72, 21, 60, 6, 24, 33, 61, 21, 85, 31, 49, 13, 93, 18, 90, 9, 16, 135, 19, 55, 9, 135, 60, 6, 30, 3, 16, 115, 114, 19, 99, 15, 147, 171, 42]

cp's OEIS Frontend

A121172 Smallest integer k>0 such that k*10^n + 1 is a prime.

Table of values

List of values

n	a(n)
1	1
2	1
3	3
4	7
5	7
6	22
7	3
8	6
9	6
10	3
11	19
12	18
13	4
14	39
15	6
16	13
17	37
18	15
19	15
20	6
21	16
22	9
23	96
24	61
25	19
26	6
27	9
28	3
29	33
30	63
31	57
32	117
33	55
34	49
35	30
36	3
37	28
38	6
39	42
40	24
41	36
42	72
43	21
44	60
45	6
46	24
47	33
48	61
49	21
50	85
51	31
52	49
53	13
54	93
55	18
56	90
57	9
58	16
59	135
60	19
61	55
62	9
63	135
64	60
65	6
66	30
67	3
68	16
69	115
70	114
71	19
72	99
73	15
74	147
75	171
76	42

n	a(n)
1	1
2	1
3	3
4	7
5	7
6	22
7	3
8	6
9	6
10	3
11	19
12	18
13	4
14	39
15	6
16	13
17	37
18	15
19	15
20	6
21	16
22	9
23	96
24	61
25	19
26	6
27	9
28	3
29	33
30	63
31	57
32	117
33	55
34	49
35	30
36	3
37	28
38	6
39	42
40	24
41	36
42	72
43	21
44	60
45	6
46	24
47	33
48	61
49	21
50	85
51	31
52	49
53	13
54	93
55	18
56	90
57	9
58	16
59	135
60	19
61	55
62	9
63	135
64	60
65	6
66	30
67	3
68	16
69	115
70	114
71	19
72	99
73	15
74	147
75	171
76	42

n	a(n)
1	1
2	1
3	3
4	7
5	7
6	22
7	3
8	6
9	6
10	3
11	19
12	18
13	4
14	39
15	6
16	13
17	37
18	15
19	15
20	6
21	16
22	9
23	96
24	61
25	19
26	6
27	9
28	3
29	33
30	63
31	57
32	117
33	55
34	49
35	30
36	3
37	28
38	6
39	42
40	24
41	36
42	72
43	21
44	60
45	6
46	24
47	33
48	61
49	21
50	85
51	31
52	49
53	13
54	93
55	18
56	90
57	9
58	16
59	135
60	19
61	55
62	9
63	135
64	60
65	6
66	30
67	3
68	16
69	115
70	114
71	19
72	99
73	15
74	147
75	171
76	42