fixed a logic mistake not caught during the conversion from index to bitmask that caused an error in the number of primes found to be 1 more than the correct amount.
fixed a logic mistake not caught during the conversion from index to bitmask that caused an error in the number of primes found to be 1 more than the correct amount.

stumped2/school,stumped2/school,stumped2/school,stumped2/school,stumped2/school,stumped2/school,stumped2/school,stumped2/school