A111477 - cp's OEIS frontend

A111477 a(1) = 11, a(n) = least k such that concatenation of n copies of k with all previous concatenation gives a prime.

n	a(n)
1	11
2	19
3	19
4	37
5	21
6	71
7	101
8	39
9	61
10	87
11	227
12	63
13	437
14	153
15	1363
16	117
17	363
18	861
19	609
20	249
21	23
22	1077
23	3123
24	771
25	3717
26	633
27	279
28	1119
29	927
30	107
31	3843
32	4313
33	1729
34	627
35	12541
36	2403
37	4083
38	1239
39	2227
40	6441
41	3819
42	3983
43	5631
44	2303
45	2971
46	19217
47	3633
48	5109
49	14413
50	913

[11, 19, 19, 37, 21, 71, 101, 39, 61, 87, 227, 63, 437, 153, 1363, 117, 363, 861, 609, 249, 23, 1077, 3123, 771, 3717, 633, 279, 1119, 927, 107, 3843, 4313, 1729, 627, 12541, 2403, 4083, 1239, 2227, 6441, 3819, 3983, 5631, 2303, 2971, 19217, 3633, 5109, 14413, 913]

cp's OEIS Frontend

A111477 a(1) = 11, a(n) = least k such that concatenation of n copies of k with all previous concatenation gives a prime.

Table of values

List of values