Greplin_Problem_3.rb

require "prime"

fib = Fiber.new do
  x, y = 0, 1
  loop do
    Fiber.yield y
    x,y = y, x+y
  end
end

min = gets.chomp.to_i
loop do
  tmp = fib.resume
  if tmp > min and tmp.prime?
    sum = 0
    (tmp+1).prime_division.each { |divs| sum += divs.first }
    puts sum
    break
  end
end