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Perfect totient numbers: Difference between revisions
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This REXX version is over ''twice'' as fast as the unoptimized version.
It takes advantage of the fact that all known perfect totient numbers less than '''3<sup>22</sup>''' have at least one of these factors: '''3''', '''5''', or '''7'''
('''3<sup>22</sup>''' '''=''' '''31,381,059,609''').
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