Random Password Generation

In my college days, now far gone, I found an engineering book with a page filled with a grid of numbers. No matter how I looked at the number sequence (up, down, left, right or diagonally) as long as I kept going sequencially with a minimum of fourdigits, it would generate hundreds of unique number combinations, great for numerical password generation!
Question: Anybody know where I can find such a thing online? Gonna assign passwrods to 300 reluctant, Idonwannapassword teachers. Thanks