A069605 - cp's OEIS frontend

A069605 a(1) = 3; a(n) = smallest number such that the concatenation a(1)a(2)...a(n) is a prime.

n	a(n)
1	3
2	1
3	1
4	9
5	3
6	17
7	1
8	3
9	9
10	39
11	33
12	53
13	1
14	21
15	27
16	113
17	99
18	123
19	3
20	91
21	39
22	29
23	141
24	87
25	67
26	297
27	87
28	333
29	59
30	67
31	509
32	103
33	279
34	99
35	141
36	107
37	9
38	1
39	123
40	83
41	529
42	521
43	517
44	137
45	249
46	459
47	543
48	583
49	513
50	21
51	53
52	1029
53	657
54	219
55	313
56	17
57	237
58	19
59	689
60	339
61	307
62	23

[3, 1, 1, 9, 3, 17, 1, 3, 9, 39, 33, 53, 1, 21, 27, 113, 99, 123, 3, 91, 39, 29, 141, 87, 67, 297, 87, 333, 59, 67, 509, 103, 279, 99, 141, 107, 9, 1, 123, 83, 529, 521, 517, 137, 249, 459, 543, 583, 513, 21, 53, 1029, 657, 219, 313, 17, 237, 19, 689, 339, 307, 23]

cp's OEIS Frontend

A069605 a(1) = 3; a(n) = smallest number such that the concatenation a(1)a(2)...a(n) is a prime.

Table of values

List of values