- Optimizations in Number lpf(n) when n is very large, by using o…

…ur fast `trial_factor(n,k)` method.

Example:

	say lpf(fib(50402326))		#=> 37 (takes only 0.39s -- before it took over 19s)

Also faster for:

	for k in (3..1000) {
 	   say (k! / (k-2)! -> fib.lpf)
	}

The above code now takes only 1.3s to run. Before it took over 10s.

lib/Sidef/Types/Number/Number.pm

@@ -9601,12 +9601,23 @@ package Sidef::Types::Number::Number {
             return bless \$z;
         }
 
-        foreach my $p (2, 3, 5, 7, 11) {
+        foreach my $p (2, 3, 5) {
             if (Math::GMPz::Rmpz_divisible_ui_p($z, $p)) {
                 return __PACKAGE__->_set_uint($p);
             }
         }
 
+        state $bounds = [map { __PACKAGE__->_set_uint($_) } (1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8)];
+
+        foreach my $k (@$bounds) {
+
+            my $factors = $_[0]->trial_factor($k);
+
+            if (@$factors > 1) {
+                return $factors->[0];
+            }
+        }
+
         my $nstr = (
                       Math::GMPz::Rmpz_fits_ulong_p($z)
                     ? Math::GMPz::Rmpz_get_ui($z)
@@ -9617,15 +9628,6 @@ package Sidef::Types::Number::Number {
             return bless \$z;
         }
 
-        foreach my $k (1e4, 1e6, 1e7) {
-
-            my @f = Math::Prime::Util::GMP::trial_factor($nstr, $k);
-
-            if (@f > 1) {
-                return __PACKAGE__->_set_uint($f[0]);
-            }
-        }
-
         my @f = Math::Prime::Util::GMP::factor($nstr);
 
         __PACKAGE__->_set_str('int', $f[0]);