Tough Problem 6 (VBA)

You could reduce the possible number of primes by looking at the last digit of the composite.

If it ends in 1, just search for primes ending in 1, 3, or 9
If it ends in 3, just search for primes ending in 1 or 7
If it ends in 7, just search for primes ending in 1 or 3
If it ends in 9, just search for primes ending in 1, 3, or 7
 

Excel Facts

Which came first: VisiCalc or Lotus 1-2-3?
Dan Bricklin and Bob Frankston debuted VisiCalc in 1979 as a Visible Calculator. Lotus 1-2-3 debuted in the early 1980's, from Mitch Kapor.
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