def multipleUpTo20
  divisible = nil
  i = 2
  while !divisible
    numFound = true
    puts "checking #{i}"
    for j in (2..20)
      if !(i % j == 0)
        numFound = false
      end
    end
    if numFound
      return i
    end
    i += 1
  end
end

puts multipleUpTo20


2*3*2*5*7*2*3*11*13*2*17*19