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M7

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M7
Prime class :
Type : Mersenne prime
Formula : Mn = 2n - 1
Prime data :
Rank : 7
n-value : 19
Number : 524287
Digits : 6
Perfect number : 218 • (219-1)
Digits : 12
Discovery data :
Date of Discovery : 1588
Discoverer : Pietro Cataldi
Found with : Trial factoring