% -*- texinfo -*-
% @deftypefn {Function File} {@var{p} =} factor (@var{q})
% @deftypefnx {Function File} {[@var{p}, @var{n}] =} factor (@var{q})
%
% Return prime factorization of @var{q}. That is, @code{prod (@var{p})
% == @var{q}} and every element of @var{p} is a prime number. If
% @code{@var{q} == 1}, returns 1.
%
% With two output arguments, return the unique primes @var{p} and
% their multiplicities. That is, @code{prod (@var{p} .^ @var{n}) ==
% @var{q}}.
% @seealso{gcd, lcm}
% @end deftypefn