A263182 - cp's OEIS frontend

A263182 Smallest k such that k//A002275(n)//k is prime, where // denotes concatenation and A002275(n) is the n-th repunit (R_n).

n	a(n)
0	1
1	3
2	13
3	17
4	1073
5	19
6	17
7	29
8	10000117
9	73
10	17
11	3
12	1007
13	3
14	43
15	11
16	1000000000000029
17	1
18	31
19	11
20	1191
21	1
22	1143
23	31
24	10000079
25	21
26	91
27	59
28	1019
29	3
30	67
31	117
32	10000000000000000000000000000077
33	109
34	89
35	49
36	1097
37	41
38	1053
39	43
40	10000047
41	87
42	23
43	53
44	1149
45	83
46	57

[1, 3, 13, 17, 1073, 19, 17, 29, 10000117, 73, 17, 3, 1007, 3, 43, 11, 1000000000000029, 1, 31, 11, 1191, 1, 1143, 31, 10000079, 21, 91, 59, 1019, 3, 67, 117, 10000000000000000000000000000077, 109, 89, 49, 1097, 41, 1053, 43, 10000047, 87, 23, 53, 1149, 83, 57]

cp's OEIS Frontend

A263182 Smallest k such that k//A002275(n)//k is prime, where // denotes concatenation and A002275(n) is the n-th repunit (R_n).

Table of values

List of values