% perl -MMath::BigApprox=c -e'$s= time(); $f= !c(203259); print $f, $/, time()-$s," seconds\n"'
4.81043e+990637
14 seconds
% perl -MMath::BigApprox=c -e'$s= time(); $f= !c(2032597); print $f, $/, time()-$s," seconds\n"'
1e+11938984
133 seconds