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n=gets.to_i a=[] t=2 (a<<t if(2...t).all?{|i|t%i!=0} t+=1)while !a[n-1] p a
->n{a=[] t=2 (a<<t if(2...t).all?{|i|t%i!=0} t+=1)while !a[n-1] a}
Works by trial division
