Sometimes a lazy mathematician can be a good mathematician. In the process we learn about modular arithmetic.

For thousands of years prime numbers were beautiful, interesting .....but useless. If you understand modular arithmetic explains the mathematics of RSA public code encryption. Additional tags: randal randall hayman rsa code prime primes pure mathematics mathematical stories public key encryption

Using very simple mathematics we see how the number 4900 is special.

How many examples of e being everywhere can I explain in 3 minutes?

A quote from a famous mathematician. How did the number come about and just how large is the number?