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How many positive integers less than 500 are the product of exactly two distinct (meaning different) primes, each of which is greater than 10?

 Mar 31, 2021
 #1
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I solved it by compuer program:

 

for (a = 10..500)

for (b = a + 1..500)

  if a is prime and b is prime and a*b < 500 then count++

output(count)

 

output = 25

 Mar 31, 2021

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