The Birthday Paradox explained and an interactive example included on the page.

Here is highly visual and useful page on permutations and combinations. The language is very informal.

A visual of a Cantor Set

A visual of a Cantor Set

Step One: Gentle intro

“Are rational numbers countable?”

Step Two: The Hotel Infinity

“Related to Cantor’s argument that rational numbers are countable?”

Step Three: Self Similarity

“Can you write out details of constructing the Cantor Set?”

This PDF explains what GIMPS is exactly.

The homepage and the software is here.

More information on primes can be found here.

GIMPS is made possible by the EFF who have a Wiki.

(Other projects)

A student mathematics resource in the form of a blog.