Any resources of questions on Pell's and Di equations?

[matqkks]

Are there any resources of questions on the topic of Pell's and non linear Diophantine equations? I am looking for interesting results which are required to be solved. This is for a typical second year undergraduate level.
Thanks.

 

[jedishrfu]

This website talks about them briefly and may be a good resource to follow up with:

http://mathforum.org/library/drmath/view/68414.html