Prime numbers that can be written as the concatenation of two other prime numbers in exactly one way.
23, 37, 53, 73, 113, 137, 173, 193, 197, 211, 223, 229, 233, 241, 271, 283, 293, 307
1 seqfan posts
Thu Oct 15 12:30:56 CEST 2009 [seqfan] Integers formed by concatenating primes