+The first known prime found to exceed one million digits was discovered
+in 1999, and is a Mersenne prime of the form 2^(6972593)−1; it contains
+exactly 2,098,960 digits. Subsequently other Mersenne primes, of the
+form 2^(p)−1, have been found which contain more digits.
+However, in 2004 there was found a massive non-Mersenne prime which
+contains 2,357,207 digits: 28433×2^(7830457)+1.
+Find the last ten digits of this prime number.
+ for x in xrange(7830457):
+if __name__ == '__main__':