How Was F6 Factored?

  title={How Was F6 Factored?},
  author={Hugh C. Williams},
In 1880 at the age of 82 Fortuné Landry factored the 20 digit number F6 = 264 + 1 . How did he do it? Landry himself never described how he factored F6 ; however, he did leave enough clues in his work and letters to provide some indication of the ideas with which he was working. In this paper we present a likely reconstruction of Landry's technique. 


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