A083996 - cp's OEIS frontend

A083996 a(1) = 1; then numbers such that the concatenation a(n)a(n-1)...a(2)a(1)a(2)...a(n-1)a(n) is a prime for n>1.

n	a(n)
1	1
2	3
3	9
4	3
5	11
6	1
7	23
8	49
9	21
10	3
11	17
12	9
13	13
14	3
15	47
16	19
17	41
18	43
19	3
20	51
21	371
22	183
23	3
24	21
25	103
26	53
27	33
28	33
29	91
30	41
31	99
32	433
33	443
34	93
35	111
36	501
37	73
38	11
39	139
40	177
41	171
42	429
43	521
44	333
45	417
46	1
47	341
48	213
49	253
50	171
51	387
52	171
53	779
54	463
55	687
56	861
57	1131
58	39
59	539
60	231
61	1513
62	263
63	369

[1, 3, 9, 3, 11, 1, 23, 49, 21, 3, 17, 9, 13, 3, 47, 19, 41, 43, 3, 51, 371, 183, 3, 21, 103, 53, 33, 33, 91, 41, 99, 433, 443, 93, 111, 501, 73, 11, 139, 177, 171, 429, 521, 333, 417, 1, 341, 213, 253, 171, 387, 171, 779, 463, 687, 861, 1131, 39, 539, 231, 1513, 263, 369]

cp's OEIS Frontend

A083996 a(1) = 1; then numbers such that the concatenation a(n)a(n-1)...a(2)a(1)a(2)...a(n-1)a(n) is a prime for n>1.

Table of values

List of values