# Pastebin 8nBNc9sw
Error in ./test.cr:21: instantiating 'is_prime(Int32)'                                                                                                         
                                                                                                                                                               
        if num % i == 0 && is_prime(i)                                                                                                                         
                           ^~~~~~~~                                                                                                                            
                                                                                                                                                               
in ./test.cr:8: no overload matches 'Range(Float64)#initialize' with types Int32, Float64, Bool                                                                
Overloads are:                                                                                                                                                 
 - Range(Float64)#initialize(begin : Float64, end : Float64, exclusive : Bool)                                                                                 
                                                                                                                                                               
        (2..Math.sqrt(x).ceil + 1).each do |i|                                                                                                                 
  ^