
Curios:
Curios Search:
Participate: 
(3217, 7213) is the only pair of primes formed from a doubledigit number n, (n=37), by inserting the product of its digits in between the digits of the number n and in between the digits of the reversal of n. [Loungrides]
(There is one curio for this number that has not yet been approved by an editor.)
Prime Curios! © 20002018 (all rights
reserved)
privacy statement
