A166733 Numbers n with the property that the concatenation of the trivial divisors of n (i.e., 1 and n) is a prime.

3, 7, 9, 13, 27, 31, 37, 39, 49, 51, 57, 63, 67, 73, 79, 81, 91, 93, 97, 99, 103, 109, 117, 123, 129, 151, 153, 163, 171, 181, 187, 193, 201, 213, 217, 223, 229, 231, 237, 249, 259, 277, 279, 283, 289, 291, 297, 301, 303, 307, 319, 321, 327, 361, 367, 373, 381

Offset: 1

Author

Juri-Stepan Gerasimov, Oct 20 2009

Keywords

• nonn
• base

Comments

Essentially the same as A032664. - R. J. Mathar, Oct 23 2009

Examples

			3 -> 13; 7 -> 17; 9 -> 19; 13 -> 113.
		

Crossrefs

Cf. A120712.

Extensions

Edited by Charles R Greathouse IV, Apr 24 2010