Perfect numbers: Difference between revisions

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m (→‎{{header|REXX}}: elided a comment concerning an optimization that was removed earlier, the condition for the optimization was too rare to warrent a test.)
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:::*   testing bypasses the test of the first and last factors
:::*   testing bypasses the test of the first and last factors
:::*   the ''corresponding factor'' is used when a factor is found
:::*   the ''corresponding factor'' is used when a factor is found
:::*   testing is stopped if the sum of the factors exceeds   '''X'''
<lang rexx>/*REXX program tests if a number (or a range of numbers) is/are perfect. */
<lang rexx>/*REXX program tests if a number (or a range of numbers) is/are perfect. */
parse arg low high . /*obtain optional arguments from the CL*/
parse arg low high . /*obtain optional arguments from the CL*/