31
This number is a prime.
Just showing those entries submitted by 'Capelle': (Click here to show all)
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(3131 - 1)/(31 - 1) is prime. [Capelle]
3^31 - 2^31 is prime. [Capelle]
The largest known prime number such that the digits of its
square are in descending order. [Capelle]
The largest known prime number p such that the decimal
expansion of 3p does not
contain any zero. [Capelle]
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