# All odd numbers are prime...

Michael Gebis writes as follows...

A mathematician, an engineer, and a physicist are asked to prove or disprove "all odd numbers are prime."

``` Mathematician:
"3 is prime.
5 is prime.
7 is prime.
9 is not prime. Therefore, it's false."

Engineer:
"3 is prime.
5 is prime.
7 is prime. Therefore, by induction, it must be true."

Physicist:
"3 is prime.
5 is prime.
7 is prime.
9 is prime.
11 is prime...."
```
```Statistician:

"3 is prime.
5 is prime.
7 is prime.
9 is an outlier.
11 is prime...."
13 is prime

all odd numbers are prime.
```
```Economist:

1 is prime,
2 is prime,
3 is prime,
4 is prime,
all odd numbers are prime...
```
```Epidemiologist:

3 is prime
5 is prime
7 is prime
9 is not
11 is prime...

"Most odd numbers are prime."

Reporter on evening news:

"A recent epidemiological study proves that many odd numbers cause cancer
and may cause birth defects, but you should check with your doctor."
```
Eric S. Raymond adds...
```Feminist:

3 is prime
5 is prime
7 is prime

Your failure to recognize 9 as prime is part of the phallocentric, hegemonic
discourse by which white European males oppress womyn and persons of color.

11 is prime
13 is prime

All odd numbers are prime, worthy, and special, dammit!
```
```As an engineer, I object to being lumped into a single classification on
this issue.  The following distinctions must be made:

Engineer:
"3 is prime.
5 is prime.
7 is prime. Therefore, by induction, it must be true."

Expert Engineer:
"3 is prime.
5 is prime.  Therefore, by induction, it must be true."

Professional or Registered Engineer:
"3 is prime.   Therefore, by induction, it must be true.

Paid Court Expert:
Based on my experience, it is true
```
```On Sun, Mon, Tue, Wed, 8, 9, 10 & 11 Feb 1998, several users wrote:

> :
>
> 3 is prime
> 5 is prime
> 7 is prime
> 9 is ....
>11 is ....

Guys, I think we have beaten this dead horse down to its atomic components... :(
```
...and I think he's the closest!
```Average PC User:

3 is prime
5 is prime
7 is prime
9 is General Protection Fault, does that count?
```
```Statistician:
3 is a prime number.
5 is a prime number.
7 is a prime number.
9 is not a prime number.
11 is a prime number
13 is a prime number.
All odd numbers are prime to an 85 per cent confidence level

Computer Programmer:
3 is a prime number.
5 is a prime number.
7 is a prime number.
9 is...NOT a prime number!
11 is a prime number.
13 is a prime number.
All odd numbers are prime.
I still have bugs in my program.

Theologian:
3 is a prime number.
5 is a prime number.
7 is a prime number.
Enough with the numbers!
With God's help all odd numbers are prime.
```
Anything to add? Please don't bother to mail me with your version of this tired old joke.

Find out about REAL prime numbers here.

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