A090265 - cp's OEIS frontend

A090265 Numbers n such that the strings n9n and 9n9 are both prime.

n	a(n)
1	1
2	19
3	41
4	43
5	47
6	61
7	67
8	71
9	73
10	83
11	107
12	149
13	211
14	217
15	221
16	269
17	277
18	319
19	437
20	443
21	523
22	547
23	553
24	607
25	619
26	647
27	679
28	697
29	817
30	863
31	877
32	899
33	1171
34	1283
35	1297
36	1379
37	1481
38	1547
39	1621
40	1853
41	1867
42	1967
43	1993
44	1997
45	2021
46	2053
47	2107
48	2357
49	2359
50	2393

[1, 19, 41, 43, 47, 61, 67, 71, 73, 83, 107, 149, 211, 217, 221, 269, 277, 319, 437, 443, 523, 547, 553, 607, 619, 647, 679, 697, 817, 863, 877, 899, 1171, 1283, 1297, 1379, 1481, 1547, 1621, 1853, 1867, 1967, 1993, 1997, 2021, 2053, 2107, 2357, 2359, 2393]

cp's OEIS Frontend

A090265 Numbers n such that the strings n9n and 9n9 are both prime.

Table of values

List of values