Primality by trial division: Difference between revisions
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'1'*n !~ /^1?$|^(11+?)\1+$/
end</lang>
=={{header|Scala}}==
<lang scala>def isPrime(n: Int) = n > 1 && (Iterator.from(2) takeWhile (d => d * d <= n) forall (n % _ != 0))</lang>
=={{header|Scheme}}==
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