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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) Do you have an integer you would like to test for primality? If it is small (say less than 9007199254740991 = 2^{53}  1), then try this script: For larger numbers try Dario Alpern's exceptional online routine to factor and prove primality. Other useful links include
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