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Oct 8th, 2015
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  1. import Darwin
  2.  
  3. func isPrime(n: Double) -> Bool {
  4.  
  5. if n < 2 {
  6. return false
  7. }
  8.  
  9. if n == 2 {
  10. return true
  11. }
  12.  
  13. if n % 2 == 0 {
  14. return false
  15. }
  16.  
  17. for var i: Double = 3; i <= sqrt(n); i += 2 {
  18.  
  19. if n % i == 0 {
  20. print(n)
  21. print(i)
  22. return false
  23. }
  24.  
  25. }
  26.  
  27. return true
  28.  
  29. }
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