Rust port of GNU Factor for 128-bit integers. Some changes have been made to my preference
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Evaluation loop exits on the input of "q","quit" or "exit"
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Hexadecimal, Octal, and binary input is supported with the --hex, --oct and --bin options respectively
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Factorisations are properly represented using exponentiation and multiplication symbols
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Supports GNU factor style of formatting, with the provided --gnu flag
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Supports formatting without repeating the factor, only outputting the factors.
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Supports other related unary number theoretic functions like primality testing, euler totient, least group exponent, counting divisors, and others
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Supports filtering out primes from input via the --prime-filter option.
Currently faster than the coreutils Rust port, and begins to outspeed GNU factor for n > 2^50.
Most semiprimes will be factored in less than 60 seconds (0.6s on average for 128-bit integers)
This performance is entirely due to the machine-factor library.
Running make install, installs it to /usr/bin and redefines factor to call this program instead.
For a drop-in replacement of GNU factor edit the .bash_aliases file to alias factor='/usr/bin/rfactor --gnu'
This code is licensed under GPLv3.