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

How to create a cell-sized chart?
Tiny charts, called Sparklines, were added to Excel 2010. Look for Sparklines on the Insert tab.
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