Hw8 Grading

20 points total.

17 points 
- correctly determined which range the nth prime is in between,
but then didn't find it.
- correctly determined the nth prime, but only if it is small-ish enough - 
e.g., at most 100million.

13 points
- serious problems and does not work, but would be on the right track for 
an omp program.  But in MPI, information is only shared between processes
if messages are sent back and forth.

10 points
- Serious problems but not really close to being correct, could have been 
some effort in making the attempt.