**Mathematician:** 3 is a prime, 5 is a prime, 7 is a prime, and by induction – every odd integer higher than 2 is a prime.

** Physicist:** 3 is a prime, 5 is a prime, 7 is a prime, 9 is an experimental error, 11 is a prime,…

** Engineer:** 3 is a prime, 5 is a prime, 7 is a prime, 9 is a prime, 11 is a prime,…

** Programmer: **3 is a prime, 5 is a prime, 7 is a prime, 7 is a prime, 7 is a prime,…

**Salesperson:** 3 is a prime, 5 is a prime, 7 is a prime, 9 — we’ll do for you the best we can,…

** Computer Software Salesperson:** 3 is prime, 5 is prime, 7 is prime, 9 will be prime in the next release,…

** Biologist:** 3 is a prime, 5 is a prime, 7 is a prime, 9 — results have not arrived yet,…

** Advertiser: **3 is a prime, 5 is a prime, 7 is a prime, 11 is a prime,…

** Lawyer: **3 is a prime, 5 is a prime, 7 is a prime, 9 — there is not enough evidence to prove that it is not a prime,…

** Accountant: **3 is prime, 5 is prime, 7 is prime, 9 is prime, deducting 10% tax and 5% other obligations.

** Statistician:** Let’s try several randomly chosen numbers: 17 is a prime, 23 is a prime, 11 is a prime…

** Professor:** 3 is prime, 5 is prime, 7 is prime, and the rest are left as an exercise for the student.

** Computational linguist:** 3 is an odd prime, 5 is an odd prime, 7 is an odd prime, 9 is a very odd prime,…

** Psychologist:** 3 is a prime, 5 is a prime, 7 is a prime, 9 is a prime but tries to suppress it,…

** Psychiatrist:** 3 is a prime, 5 is a prime, 7 is a prime, 9 would be a prime if it wasn’t for his relationship with 3.

** Project Manager:** Firstly, what’s a prime, and how long will it take to make 9 one of those?

(plagiarised from somewhere….)