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M21

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M21
Prime class :
Type : Mersenne prime
Formula : Mn = 2n - 1
Prime data :
Rank : 21
n-value : 9,689
Number : 478220278805...826225754111
Digits : 2,917
Perfect number : 29,688 • (29,689-1)
Digits : 5,834
Discovery data :
Date of Discovery : 1963-05-11
Discoverer : Gillies
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