Proper divisors: Difference between revisions
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=={{header|J}}==
The proper divisors of an integer are the [[Factors of an integer]] without the integer itself.
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<lang J>factors=: [: /:~@, */&>@{@((^ i.@>:)&.>/)@q:~&__
properDivisors=: factors -.
Proper divisors of numbers 1 through 10:
<lang J> (,&": ' -- ' ,&": properDivisors)&>1+i.10
1 --
2 -- 1
3 -- 1
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