
Curios:
Curios Search:
Participate: 
The largest known composite number for which the quotient of the repunit R(n) divided by R(a)*R(b) [a and b the factors of n] forms a unique prime. I.e., 6437 = 41*157 and R(6437)/(R(41)*R(157)) is prime.
Prime Curios! © 20002018 (all rights
reserved)
privacy statement
