A281684 - cp's OEIS frontend

A281684 Least composite k such that the concatenation of n consecutive composites, starting from k, is a prime.

n	a(n)
2	8
3	138
4	87
5	88
6	14
7	122
8	121
9	70
10	21
11	206
12	405
13	94
14	15
15	82
16	195
17	27
18	729
19	266
20	358
21	136
22	318
23	592
24	18
25	342
26	202
27	1182
28	268
29	155
30	85
31	292
32	386
33	888
34	295
35	551
36	892
37	118
38	63
39	95
40	696
41	1497
42	315
43	400
44	954
45	574
46	33
47	72
48	85
49	1377
50	140
51	1417
52	158
53	448
54	994
55	1370
56	3399

[8, 138, 87, 88, 14, 122, 121, 70, 21, 206, 405, 94, 15, 82, 195, 27, 729, 266, 358, 136, 318, 592, 18, 342, 202, 1182, 268, 155, 85, 292, 386, 888, 295, 551, 892, 118, 63, 95, 696, 1497, 315, 400, 954, 574, 33, 72, 85, 1377, 140, 1417, 158, 448, 994, 1370, 3399]

cp's OEIS Frontend

A281684 Least composite k such that the concatenation of n consecutive composites, starting from k, is a prime.

Table of values

List of values