Proper divisors: Difference between revisions
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=={{header|J}}== |
=={{header|J}}== |
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{{incorrect|J|1 has no proper divisors.}} |
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The proper divisors of an integer are the [[Factors of an integer]] without the integer itself. |
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:~&__ |
<lang J>factors=: [: /:~@, */&>@{@((^ i.@>:)&.>/)@q:~&__ |
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properDivisors=: factors -. |
properDivisors=: factors -. 1:</lang> |
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Proper divisors of numbers 1 through 10: |
Proper divisors of numbers 1 through 10: |
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<lang J> (,&": ' -- ' ,&": properDivisors)&>1+i.10 |
<lang J> (,&": ' -- ' ,&": properDivisors)&>1+i.10 |
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1 -- |
1 -- |
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2 -- 1 |
2 -- 1 |
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3 -- 1 |
3 -- 1 |
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