On Fri, Nov 11, 2011 at 11:46 PM, Ja xv <jeniferjblack / hotmail.com> wrote: > question: > How would you write the code to find the prime factors of a very large > number? > > I think one of the factors is small (ie) less than 1000 > the code I have written is: <snip/> > ##I need help in writing the code, am I on the right track? I am not sure what you are looking for: are you looking for feedback on your specific code or are you looking for efficient prime factorization algorithms? In the latter, there are quire a few around and documented, for example at http://en.wikipedia.org/wiki/Category:Integer_factorization_algorithms For example this one: http://en.wikipedia.org/wiki/Quadratic_sieve Kind regards robert -- remember.guy do |as, often| as.you_can - without end http://blog.rubybestpractices.com/