A032665 Digit '2' concatenated with a(n) is a prime.

3, 9, 11, 23, 27, 29, 33, 39, 41, 51, 57, 63, 69, 71, 77, 81, 83, 93, 111, 113, 129, 131, 137, 141, 143, 153, 161, 179, 203, 207, 213, 221, 237, 239, 243, 251, 267, 269, 273, 281, 287, 293, 297, 309, 311, 333, 339, 341, 347, 351, 357, 371, 377, 381, 383, 389

Offset: 1

Author

Patrick De Geest, May 15 1998

Keywords

• nonn
• base

Links

• Seiichi Manyama, Table of n, a(n) for n = 1..10000