Two prime numbers p1 and p2 differ by 11111.

a.What are their sum and product?
b.How long did it take you to solve it?

Remember, no pen and paper.

Since the two numbers differ, one must be odd while the other is even.  The only prime number that is even is 2.  Thus the two numbers must be 2 and 11113 (assuming that 11113 is indeed prime).

a.  Sum = 11115, Product = 22226
b. Less than 10 seconds

Edited on August 13, 2010, 3:52 pm

Posted by hoodat on 2010-08-13 15:51:39