Unforgettable Fermat Factors


In the March, 1998 issue of the Mathematical Gazette, John Pollard gives several mnemonics for memorizing factors of Fermat numbers in his paper, Unforgettable Fermat Factors. The number of letters in each word of the mnemonics correspond to the digits of Fermat factors. A few of the mnemonics are below - to see the others, get a copy of the paper (highly recommended)! The F4 mnemonic is due to Richart Brent.