Perfect numbers: Difference between revisions

m
Henry's shortened expression
m (Henry's shortened expression)
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=={{header|J}}==
<lang j>is_perfect=: +: = (*//#.~ (* %&<: ]~) ~@(,{.)/.~&.q: ::0:</lang>
The program defined above, like programs found here in other languages, assumes that the input will be a scalar positive integer.
 
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