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| func isPrime(n: Int) -> Bool { | |
| if n % 2 == 0 { | |
| return false | |
| } | |
| for i in 3.stride(to: (n+1)/2, by: 2) { | |
| if n % i == 0 { | |
| return false | |
| } | |
| } | |
| return true | |
| } |
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