Vikas the link you provided is a good one with valuable data for a maths student.
Thanks for the appropriation sasikanth.K and what I think that when you are doing huge calculation the your mind get stuck at some point and all interest vanish so at that time you need some special calculator like prime factorization calculator or quadratic equation calculator which will help in huge factorization these tings irritate you lot. So its good to have some good calculator.
