Base 16 numbers needing a to f: Difference between revisions

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=={{header|J}}==
=={{header|J}}==
<syntaxhighlight lang="j">needsAtoF =: (9 ([: +./ <) 16 & #.inv)"0
<syntaxhighlight lang="j">needsAtoF=. (9 +./@:< 16&#.inv)"0


_16 echo\ (#~ needsAtoF) i. 501</syntaxhighlight>
_16 echo\ I. needsAtoF i. 501</syntaxhighlight>
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<pre>
<pre>
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