Rare numbers: Difference between revisions

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writeln "the first 5 rare numbers: ", .findfirst(5)</lang>
 
With 0.8.11, the built-in reverse() alsofunction will reversesflip the digits of a number. Without this, you could write your own function to do so as follows, (if not passed any negative numbers).
 
<lang langur>val .reverse = f toNumber join reverse split toString .n</lang>
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