Submission #1690305

---

Source Code Expand

require 'prime'
bound = 10**9
gen = Prime::EratosthenesGenerator.new
primes = 200.times.map{gen.next}
primes.each_slice(2){|p1, p2|
  prod = p1 * p2
  prod *= p1 if prod*p1<=bound
  while prod*2<=bound
    if prod*4>bound
      if prod*3<=bound
        prod *= 3
      else
        prod *= 2
      end
    else
      prod *= 2
    end
  end
  p prod
}

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