253987
This number is a prime.
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The largest known Carol prime (of the form (2^k - 1)^2 - 2) has index 253987. It was found by Cletus Emmanuel in May 2007, using the programs MultiSieve and PrimeFormGW.
Submitted: 2007-08-10 17:05:01; Last Modified: 2022-11-22 23:35:25.
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