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Re: is it prime?

by brx (Pilgrim)
on May 06, 2012 at 14:21 UTC ( #969141=note: print w/ replies, xml ) Need Help??


in reply to is it prime?

Where is my hammer?

sub isPrime($) { $n=pop; 1^(1x$n--)=~/^(1{2,$n})\1+$/; }

With n>2

Just for fun as a contrib to https://github.com/fxn/math-with-regexps/blob/master/one-liners.sh (fxn).

Update, thanks to ambrus's reply: Re^2: is it prime?

sub isPrime($) { (1x pop)!~/^(11+)\1+$/ }


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Re^2: is it prime?
by ambrus (Abbot) on May 06, 2012 at 17:32 UTC

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