RSA-640

In mathematics, RSA-640 is one of the RSA numbers - large semiprimes that are part of the RSA Factoring Challenge. RSA-640 has a length of 193 decimal digits and has not been factored so far. A cash prize of 20,000 USD has been offered for successful factorisation by RSA Security. 

RSA-640 = 31074182404900437213507500358885679300373460228427275457201619488232064405
          18081504556346829671723286782437916272838033415471073108501919548529007337
          724822783525742386454014691736602477652346609

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