Perfect numbers: Difference between revisions

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===Lucas-Lehmer method===
This version uses memoization to implement a fast version of Lucas-Lehmer test by orders of magnitude.,
<br>Itit is much faster than the tradidtionaltraditional method by orders of approachmagnitude.
<lang rexx>/*REXX program tests if a number (or a range of numbers) is/are perfect.*/
parse arg low high . /*obtain the specified number(s).*/