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Largest known prime number, spanning 41 million digits, discovered by amateur mathematician using free softwareThe new number is 2 136,279,841 – 1 ... and $250,000 await those who discover the first hundred-million-digit prime and the ...
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A 41-million-digit prime number is the biggest ever found—but mathematicians' search for perfection will continueA prime number that is one less than some power of two (or what mathematicians write as 2 p – 1) is called a Mersenne prime, after the French monk Marin Mersenne, who investigated them more than ...
Reversing the digits makes a prime number, so the first digit must be 1, 3, 7 or 9, as all two-digit prime numbers are odd and not divisible by 5. The number must be at least 20, so this rules out 1.
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