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 2021-03-02, 07:15 #10 jocelynl1204   Feb 2018 10002 Posts The input file m1571.txt looks like that: Code: METHOD=P-1; B1=200000000000; N=((2^1571-1)/1250961804686347854556649368571289367); X=0x0067F0913DBC6F1FAF640DAF4F4EA4B66858D1B6753E03ED960F83953C186BB0C5C0F519984706CCD432D54F9925B9A0B9F09D7541FFB62267F75E1A50D1F4C9F8724C79BC6823F041018D3E0561D51AE34062D91AFECA001E23436CA14248FA748C0D070D35773EF5A1248524B76B92A3164A43B6FBF617361A7AFB421254321AE855AB7E26EC4BBC34839F5C53C28CCFEE1697734A5F2BADF8C5FAB633352A73EDC1531B8EE229F8DBE053BB38CB8113B12AE16097213261BC749901C168E362A36A881FE; CHECKSUM=3043118422; PROGRAM=GMP-ECM 7.0.4; Y=0x0; X0=0x0; Y0=0x0; WHO=me@mypc; TIME=Fri Feb 5 22:54:18 2021; The command line looks like that: ecm -pm1 -v -maxmem 10000 -resume m1571.txt 200000000000 2000000000000000 -maxmem is in Mb if you know the work has been done to a certain level from that B1 to say B2 1e+20 you can have a command line that looks like that: ecm -pm1 -v -maxmem 10000 -resume m1571.txt 200000000000 100000000000000000000-100001000000000000000 of course ecm only goes to a certain level of B2 but when you reach it I would say we have done enough for that B1. Last fiddled with by axn on 2021-03-02 at 09:48