A087604 - cp's OEIS frontend

A087604 Smallest k such that n times concatenation of k with itself followed by a 3 is a prime, or 0 if no such number exists.

n	a(n)
1	1
2	1
3	0
4	1
5	4
6	0
7	2
8	1
9	0
10	1
11	4
12	0
13	37
14	7
15	0
16	17
17	149
18	0
19	185
20	7
21	0
22	73
23	1
24	0
25	5
26	47
27	0
28	38
29	4
30	0
31	4
32	133
33	0
34	52
35	2
36	0
37	194
38	46
39	0
40	37
41	29
42	0
43	29
44	25
45	0
46	19
47	14
48	0
49	74
50	8
51	0
52	19
53	20
54	0
55	442
56	83
57	0
58	358
59	211
60	0
61	16
62	298
63	0
64	260
65	5
66	0
67	305
68	71
69	0
70	8
71	323
72	0
73	5
74	109
75	0
76	8
77	68
78	0
79	767
80	367

[1, 1, 0, 1, 4, 0, 2, 1, 0, 1, 4, 0, 37, 7, 0, 17, 149, 0, 185, 7, 0, 73, 1, 0, 5, 47, 0, 38, 4, 0, 4, 133, 0, 52, 2, 0, 194, 46, 0, 37, 29, 0, 29, 25, 0, 19, 14, 0, 74, 8, 0, 19, 20, 0, 442, 83, 0, 358, 211, 0, 16, 298, 0, 260, 5, 0, 305, 71, 0, 8, 323, 0, 5, 109, 0, 8, 68, 0, 767, 367]

cp's OEIS Frontend

A087604 Smallest k such that n times concatenation of k with itself followed by a 3 is a prime, or 0 if no such number exists.

Table of values

List of values

n	a(n)
1	1
2	1
3	0
4	1
5	4
6	0
7	2
8	1
9	0
10	1
11	4
12	0
13	37
14	7
15	0
16	17
17	149
18	0
19	185
20	7
21	0
22	73
23	1
24	0
25	5
26	47
27	0
28	38
29	4
30	0
31	4
32	133
33	0
34	52
35	2
36	0
37	194
38	46
39	0
40	37
41	29
42	0
43	29
44	25
45	0
46	19
47	14
48	0
49	74
50	8
51	0
52	19
53	20
54	0
55	442
56	83
57	0
58	358
59	211
60	0
61	16
62	298
63	0
64	260
65	5
66	0
67	305
68	71
69	0
70	8
71	323
72	0
73	5
74	109
75	0
76	8
77	68
78	0
79	767
80	367

n	a(n)
1	1
2	1
3	0
4	1
5	4
6	0
7	2
8	1
9	0
10	1
11	4
12	0
13	37
14	7
15	0
16	17
17	149
18	0
19	185
20	7
21	0
22	73
23	1
24	0
25	5
26	47
27	0
28	38
29	4
30	0
31	4
32	133
33	0
34	52
35	2
36	0
37	194
38	46
39	0
40	37
41	29
42	0
43	29
44	25
45	0
46	19
47	14
48	0
49	74
50	8
51	0
52	19
53	20
54	0
55	442
56	83
57	0
58	358
59	211
60	0
61	16
62	298
63	0
64	260
65	5
66	0
67	305
68	71
69	0
70	8
71	323
72	0
73	5
74	109
75	0
76	8
77	68
78	0
79	767
80	367

n	a(n)
1	1
2	1
3	0
4	1
5	4
6	0
7	2
8	1
9	0
10	1
11	4
12	0
13	37
14	7
15	0
16	17
17	149
18	0
19	185
20	7
21	0
22	73
23	1
24	0
25	5
26	47
27	0
28	38
29	4
30	0
31	4
32	133
33	0
34	52
35	2
36	0
37	194
38	46
39	0
40	37
41	29
42	0
43	29
44	25
45	0
46	19
47	14
48	0
49	74
50	8
51	0
52	19
53	20
54	0
55	442
56	83
57	0
58	358
59	211
60	0
61	16
62	298
63	0
64	260
65	5
66	0
67	305
68	71
69	0
70	8
71	323
72	0
73	5
74	109
75	0
76	8
77	68
78	0
79	767
80	367