Не знаю, было ли...

How to prove that all odd numbers are prime ?

Well, this problem has different solutions whether you are a:

Mathematician:
1 is prime, 3 is prime, 5 is prime, 7 is prime, and by induction we have
that all the odd integers are prime.

Physicist:
1 is prime, 3 is prime, 5 is prime, 7 is prime, 9 is an experimental
error...

Engineer:
1 is prime, 3 is prime, 5 is prime, 7 is prime, 9 is prime...

Chemist:
1 prime, 3 prime, 5 prime... hey, let's publish!

Modern physicist using renormalization:
1 is prime, 3 is prime, 5 is prime, 7 is prime, 9 is ... 9/3 is prime,
11 is prime, 13 is prime, 15 is ... 15/3 is prime, 17 is prime, 19 is
prime, 21 is ... 21/3 is prime...

Quantum Physicist:
All numbers are equally prime and non-prime until observed.

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

Confused Undergraduate:
Let p be any prime number larger than 2. Then p is not divisible by 2,
so p is odd. QED

Measure nontheorist:
There are exactly as many odd numbers as primes (Euclid, Cantor), and
exactly one even prime (namely 2), so there must be exactly one odd
nonprime (namely 1).

Cosmologist:
1 is prime, yes it is true....

Computer Scientist:
1 is prime, 10 is prime, 11 is prime, 101 is prime...

Programmer:
1 is prime, 3 is prime, 5 is prime, 7 is prime, 9 will be fixed in the
next release, ...

C programmer:
01 is prime, 03 is prime, 05 is prime, 07 is prime, 09 is really 011
which everyone knows is prime, ...

BASIC programmer:
What's a prime?

COBOL programmer:
What's an odd number?

Windows programmer:
1 is prime. Wait...

Mac programmer:
Now why would anyone want to know about that? That's not user friendly.
You don't worry about it, we'll take care of it for you.

Bill Gates:
1. No one will ever need any more than 1.

ZX-81 Computer Programmer:
1 is prime, 3 is prime, Out of Memory.

Pentium owner:
1 is prime, 3 is prime, 5 is prime, 7 is prime, 8.9999978 is prime...

GNU programmer:
% prime
usage: prime [-nV] [--quiet] [--silent] [--version] [-e script]
--catenate --concatenate | c --create | d --diff --compare | r --append
| t --list | u --update | x -extract --get [ --atime-preserve ] [ -b,
--block-size N ] [ -B, --read-full-blocks ] [ -C, --directory DIR ]
[--checkpoint ] [ -f, --file [HOSTNAME:]F ] [ --force-local ] [ -F,
--info-script F --new-volume-script F ] [-G, --incremental ] [ -g,
--listed-incremental F ] [ -h, --dereference ] [ -i, --ignore-zeros ] [
--ignore-failed-read ] [ -k, --keep-old-files ] [ -K, --starting-file F
] [ -l, --one-file-system ] [ -L, --tape-length N ] [ -m,
--modification-time ] [ -M, --multi-volume ] [ -N, --after-date DATE,
--newer DATE ] [ -o, --old-archive, --portability ] [ -O, --to-stdout ]
[ -p, --same-permissions, --preserve-permissions ] [ -P,
--absolute-paths ] [ --preserve ] [ -R, --record-number ] [ [-f
script-file] [--expression=script] [--file=script-file] [file...]
prime: you must specify exactly one of the r, c, t, x, or d options
For more information, type "prime --help''

Unix programmer:
1 is prime, 3 is prime, 5 is prime, 7 is prime, ...
Segmentation fault, Core dumped.

Computer programmer:
1 is prime, 3 is prime, 5 is prime, 7 is prime, 9 is prime, 9 is prime,
9 is prime, 9 is ...
Oops, let's try that again:
1 is prime, 3 is prime, 5 is prime, 7 is prime, 9 is ... 1 is prime, 3
is prime, 5 is prime, 7 is prime, 9 is ... 1 is ...
Um, right. Okay, how about this:
1 is prime, 3 is not prime, 5 is not prime, 7 is not prime, 9 is not
prime...
So much for the beta releases. Ship this:
1 is prime, 3 is prime, 5 is prime, 7 is prime, 9 is a feature, 11 is
prime...
and put on the cover "More prime numbers than anyone else in the
industry !"

Coming soon:
1 is prime, 3 is a prime, 4 is a feature, 5 is a prime, 6 is a feature,
7 is a prime, 8 is not yet implemented, 9 is our backwards compatibility
module, ...

Computational linguist:
1 is an odd prime, 3 is an odd prime, 5 is an odd prime, 7 is an odd
prime, 9 is a very odd prime, ...

Software tech support operator:
Well, we haven't had any reports of composite odd numbers... do you have
the latest version of ZFC?

Logician:
Hypothesis: All odd numbers are prime
Proof:
If a proof exists, then the hypothesis must be true
The proof exists; you're reading it now.
From 1 and 2 follows that all odd numbers are prime

Linguist:
1 is prime, 3 is prime, 5 is prime, 7 is prime, 9 aaah. I can make 9 a
prime.

Philosopher:
Why don't we just call all the odd numbers prime and call all the prime
numbers odd, that way all the odd numbers would be prime
Philosopher (2):
1 is prime. Hum, that's an interesting statement, I'll get one of my
research students to look into that.

Economist:
Assume 9 is prime...

Economist (2):
2 is a prime, 4 is a prime.

Economist (3):
2 is even, 4 is even, 6 is even...

Economist (4):
1 is prime, 3 is prime, 5 is prime, 7 is prime, 9 is not prime. Look,
the prime rate is dropping.

Statistician:
100% of the sample 5, 13, 37, 41 and 53 is prime, so all odd numbers
must be prime.

Mechanical Statistician:
1 is prime, 3 is prime, 5 is prime, 7 is prime, 9 is an outlier, 11 is
prime, 13 is prime...

English major:
What's a prime number ?

Politician:
What's a number ?

Philosophy major:
What is ?

Athletic scholarship:
What !?

Mid-level manager:
1 is prime, 3 is prime, 5 is prime, 7 is prime, 9 is... Who can I
delegate this to ?

Lawyer:
1 is prime, 3 is prime, 5 is prime, 7 is prime, although there appears
to be prima facie evidence that 9 is not prime, there exists substantial
precedent to indicate that nine should be considered prime. The
following brief presents the case for nine's primeness ...

Salesman:
1 is prime, 3 is prime, 5 is prime, 7 is prime, and with 9 you get five
excellent primes for the price of three !

Anthropologist:
Prime or not, every number is unique. Take 9 for example...

Liberal:
The fact that nine is not prime indicates a deprived cultural
environment which can only be remedied by a federally funded cultural
enrichment program.

Bush:
What's nine got against being prime? I'll bet it won't allow the pledge
of allegiance to be said in our schools either.

Nixon:
Put nine on the enemies list. I'm gonna get that number.

New Yorker:
1 is prime, 3 is prime, 5 is prime, 7 is prime, 9 is ... NONE OF YOUR
DAMN BUSINESS!

rec.humor poster:
1 is prime, 1 is prime, 1 is prime, 1 is prime
--
With best regards,
Pavel Dvorkin