PrimitiveRoot[n] gives the smallest primitive root of n.
PrincipalValue is an option for Integrate that specifies whether the Cauchy principal value should be found for a definite integral.
PrintAction is an option for notebooks that specifies the action taken when a Print[] command is evaluated by the kernel.
PrintingCopies is an option for notebooks that specifies the number of copies of a notebook printed when a print command is given.
PrintingOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option that specifies settings for printing.
PrintingPageRange is an option for notebooks that specifies the range of pages of a notebook to be printed.
PrintPrecision is an option for selections that specifies the maximum number of digits used for displaying a machine-precision number.
PrintTemporary[expr] prints expr as a temporary cell in a notebook, removing it when the evaluation of the current input line is complete.
PrivateEvaluationOptions -> {opt_1 -> val_1, opt_2 -> val_2} is an option for selections that specifies settings for evaluation-related suboptions.
PrivateFontOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for selections that specifies settings for various font suboptions.