Perfect totient numbers: Difference between revisions
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<pre> |
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The first 20 perfect totient numbers are: |
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[3,9,15,27,39,81,111,183,243,255,327,363,471,729,2187,2199,3063,4359,4375,5571] |
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</pre> |
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=={{header|Ruby}}== |
=={{header|Ruby}}== |