Prime Numbers

A mathemetician, a physicist, an engineer, and a computer scientist were asked to prove "All odd numbers greater than one are prime".


The mathemetician said: 3 is prime, 5 is prime, 7 is prime. By induction, all odd numbers greater than 1 are prime.


The physicist saind: 3 is prime, 5 is prime, 7 is prime, 9 is experimental error, 11 is prime. All odd numbers greater than 1 are prime.


The engineer said: 3 is prime, 5 is prime, 7 is prime, 9 is prime ...


The computer scientist wrote a program. When he ran it, it printed out:

3 is prime.

3 is prime.

3 is prime.

3 is prime.

...