Question 214394: what 2 prime numbers if multiplied equal 400-digit number?
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! There are several combinations that could fit that.
2 200-digit primes, a 100 and a 300 digit #, etc.
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In some cases, 2 200-digit #s will give a 399 digit product.
EG, 23*29 = 667 (3 digits)
31*43 = 1333 (4 digits)
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If the product of the 2 MS digits is more than 10, the result will be 400 digits.
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