LOok:
here is:
Enter a prime number: 2^1741-1
123943127595827984958197853301549195184477
951834649657232740658002980565512365360620
750598993511752753104781984819812404805160
890680671892376416742365754415406079582806
461586400276749177364829017737044195679413
446889774379589504010560948137281790718665
410595066884189580638081516368262928596510
612673202568108065230108178215006522436790
409863754899181812033711098574995216116141
064253029870990368664577321247037027510999
375505505057966517508215106597988717628821
189242173762409427175322603725836942582902
938380429071380119551
Now at
Alpertron
Try factoring this 2^1741-1 at Alpertron and it will take a
long time its been 7 minutes and my program did it under 2 seconds.