Determine Prime Numbers with XQuery

Did you know you can determine if a number is prime by calling an XQuery query? Here’s the code:

<prime_numbers>    {    for $a in (1 to 50)     return(           if(not(some $counter in (2 to ($a - 1)) satisfies $a mod               $contor=0)) then {$a}              else {$a}           )    }

And here’s a fragment of the result:

   1   2   3   4   5   6   7   8    ...
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