Hello together,

I´m a new member and I used in Maple 2017 the function "is prime" for the largest known Mersenne prime (2^77,232,917 − 1) with the command "isprime (2^77,232,917 − 1)" to test how much time the programm needs that it returns "true".

1.) Has anybody experiences with the function "is prime" in relation with such a large Mersenne prime ( 2^77,232,917 − 1) or similar Mersenne primes like ( 2^57,885,161 − 1), ( 2^74,207,281 − 1), etc... ? How many days it takes to get the confirmation in my case ?

My processor: Intel i5-4590 CPU @ 3.30 GHz

System type: 64 Bit  

I started the function isprime(2^77,232,917 − 1) before 5 days. The programm is still evaluating, next to "evaluating" the point changes his colors (black and white) continuous, so I think the programm is still working, but the memory stopped at 2440.33 M and the time stopped at 12326.65 s

2.) Has anybody an idea why Maple has stopped to count the time and the memory in this case ? 

I hope that somebody can answer my 2 questions....thx...