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So recently in my Built-in class extension's script I released a method that can tell if a number is prime or not. The code works (at least for most of the numbers I have tried) but it is slower than a snail moving through molasses with large numbers. Taking as long as three seconds to tell if this number: 9369319 is a prime. (which it is). I am using a brute division method to make these determinations. I am wondering if anyone has any ideas to make it run faster.
module Math def self.prime?(arg) f = arg.to_i if f < 263882790666230 i = 2 while i <= Math.sqrt(f).ceil if f % (i) === 0 && f != (i) return false end if i.even? i += 1 else i += 2 end end if i > Math.sqrt(f).ceil && f != 0 && f != 1 return true end else puts "Error: Number must be below 263882790666230 to help prevent long processing times" end end endThoughts?
module Math def self.prime?(arg) f = arg.to_i if f < 263882790666230 i = 2 while i <= Math.sqrt(f).ceil if f % (i) === 0 && f != (i) return false end if i.even? i += 1 else i += 2 end end if i > Math.sqrt(f).ceil && f != 0 && f != 1 return true end else puts "Error: Number must be below 263882790666230 to help prevent long processing times" end end endThoughts?
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