Editing ray

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def sieve_of_eratosthenes(max_prime) sieve = Array.new(max_prime, true) sieve[0] = sieve[1] = false 2.upto(Math.sqrt(max_prime)) do |i| if sieve[i] (i**2).step(max_prime, i) do |j| sieve[j] = false end end end result = [] sieve.each_index do |i| result << i if sieve[i] end return result end

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