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 2021-07-27, 13:21 #16 EdH     "Ed Hall" Dec 2009 Adirondack Mtns 2·29·71 Posts I might be misunderstanding something (probably), but I'm not finding a runtime log or an error message. However, the third candidate in my test run failed and I'm not sure why. That composite is made up of a bunch of p3s and p4s and YAFU factored it in the Colab session when I ran it outside of the script. sample run of script: Code: Installing system packages. . . Retrieving GMP-ECM. . . Compiling GMP-ECM. . . Finished installing GMP-ECM. . . Retrieving YAFU. . . Compiling YAFU. . . Finished compiling YAFU. . . Starting the factoring of 3 composites. . . Composite 1: 8869475002717536050312782604253426183326192888885941092918900891116352039782449522669 <85> Factors (6:59): 3211610951880144183669785219693807857*2761690359015982301564877430778307467378692976317 Composite 2: 1128164293201891394597728447518614695546967713433260789629082173322486406149926324143 <85> Factors (6:02): 29751725740768035469240132235509074973407496022009533350217*37919289221465108716321079 Composite 3: 3895909508598394792966931237542439743139398349882487979187550567767896277846662661167 <85> Factors (0:00): Completed all 3 composites! factor log of third candidate run in isolation: Code: fac: factoring 3895909508598394792966931237542439743139398349882487979187550567767896277846662661167 fac: using pretesting plan: normal fac: no tune info: using qs/gnfs crossover of 95 digits fac: no tune info: using qs/snfs crossover of 75 digits div: primes less than 10000 Total factoring time = 0.0034 seconds ***factors found*** P3 = 911 P3 = 941 P3 = 953 P3 = 967 P3 = 971 P3 = 977 P3 = 983 P3 = 991 P4 = 1009 P4 = 1019 P4 = 1031 P4 = 1033 P4 = 1039 P4 = 1049 P4 = 1061 P4 = 1063 P4 = 1087 P4 = 1091 P4 = 1093 P4 = 1097 P4 = 1103 P4 = 1109 P4 = 1117 P4 = 1129 P4 = 1151 P4 = 1153 P4 = 1163 P4 = 1171 1