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find the next largest probable prime number
NextProbPrime(N: INT): INT 
This function computes the smallest probable prime number greater than N. If
N is negative, an error is generated. To be absolutely certain the number
produced is prime, you must call IsPrime on it, but this may be very costly.
/**/ NextProbPrime(1000);
1009
/**/ NextProbPrime(10^50);
100000000000000000000000000000000000000000000000151
