
Curios:
Curios Search:
Participate: 
This prime is the concatenation of the Sophie Germain prime
p=23 and the corresponding safe prime 2p+1. It is the
largest such prime to have nondecreasing digits. [Hasler]
2347 and 4723 are the only primes concatenated from two doubledigit primes whose the products of digits are perfect numbers, i.e., 6, 28. [Loungrides]
Prime Curios! © 20002018 (all rights
reserved)
