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function isprime(n) {
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if (n<5) return(n==2 | n==3)
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else if (mod(n, 2)==0) return(0)
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else {
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for (k=3; k*k<=n; k=k+2) {
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if (mod(n, k)==0) return(0)
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}
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return(1)
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}
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}
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isprime(10^12-11)
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1
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