
Curios:
Curios Search:
Participate: 
A palindromic primedigit composite whose sum of the digits is a palindromic prime. Note that the product of the digits is a perfect number. [Skaflotten]
272^{2} + 272^{7} + 272^{2} + 1 is prime. [Opao] n^{6} + 272 is composite for all n up to 2162. [Wesolowski]
Prime Curios! © 20002018 (all rights
reserved)
privacy statement
