An interesting (unknown) property of prime numbers.
If you feel you really have something, you could always type up a paper and post it on the preprint archive... http://arxiv.org/ That would establish precedence and probably get you a host of feedback as well.
I believe that posting your observation here will clarify that the observation is yours.
Also as Bill Cook mentions http://arxiv.org/ would be the best place to post your discovery.
But if you don't tell us which is the ''unknown property of prime numbers'' you will never know if you are a genius, or someone who has illusions.
Share your thoughts! I really want to see something that might be new and (as you say) interesting!