Classification of a prime number in the Pari-GP Programming Language How to install Pari-GP (On Ubuntu) sudo apt-get install pari-gp How to run In gp console: \r prime_classes.gp p=2017 iswhatprime(p) To run the script from a Linux shell (e.g., for automation), use gp's -q option: $ (cat prime_classes.gp; echo "p=2017;"; echo "iswhatprime(p)") | gp -q