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 2020-01-23, 14:42 #4 storm5510 Random Account     Aug 2009 U.S.A. 32×137 Posts I was learning to use the ABC2 input type for PFGW early this morning when I came up with these: Code: 10*2^13509-1 is 3-PRP! (0.0290s+0.0015s) 10*2^21737-1 is 3-PRP! (0.0676s+0.0011s) 10*2^25623-1 is 3-PRP! (0.0805s+0.0011s) I am not sure about the meaning of "3-" in this instance. I know how to calculate the number of digits in 2p-1. How that translates to something in this format, I do now know. Thanks.