A083754 - cp's OEIS frontend

A083754 a(1) = 1 and then smallest odd number not occurring earlier such that the concatenation a(1)a(2)a(3)... is a prime.

n	a(n)
1	1
2	3
3	7
4	11
5	9
6	27
7	63
8	31
9	53
10	21
11	13
12	83
13	33
14	39
15	49
16	51
17	77
18	87
19	307
20	29
21	229
22	281
23	151
24	173
25	481
26	41
27	99
28	157
29	177
30	17
31	357
32	213
33	231
34	171
35	271
36	557
37	67
38	113
39	463
40	159
41	119
42	57
43	247
44	147
45	563
46	409
47	353
48	391
49	179
50	1051
51	209
52	19
53	153
54	621
55	287
56	567
57	313
58	117
59	363

[1, 3, 7, 11, 9, 27, 63, 31, 53, 21, 13, 83, 33, 39, 49, 51, 77, 87, 307, 29, 229, 281, 151, 173, 481, 41, 99, 157, 177, 17, 357, 213, 231, 171, 271, 557, 67, 113, 463, 159, 119, 57, 247, 147, 563, 409, 353, 391, 179, 1051, 209, 19, 153, 621, 287, 567, 313, 117, 363]

cp's OEIS Frontend

A083754 a(1) = 1 and then smallest odd number not occurring earlier such that the concatenation a(1)a(2)a(3)... is a prime.

Table of values

List of values