How to prove that all odd numbers are prime ?%%%

Well, this problem has different solutions whether you are a:%%% 'Mathematician:'%%% 3 is prime, 5 is prime, 7 is prime, and by induction we have that all the odd integers re prime.%%% 'Physicist:'%%% 3 is prime, 5 is prime, 7 is prime, 9 is an experimental error...%%% 'Engineer:'%%% 3 is prime, 5 is prime, 7 is prime, 9 is prime...%%% 'Chemist:'%%% 3 is prime, 5 is prime... hey, let's publish====%%%

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'Modern physicist using renormalization:'%%% 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:'%%% 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:'%%% 3 is prime, yes it is true....%%% 'Computer Scientist:'%%% 10 is prime, 11 is prime, 101 is prime...%%% 'Programmer:'%%% 3 is prime, 5 is prime, 7 is prime, 9 will be fixed in the next release, ...%%% 'C programmer:'%%% 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:'%%% 3 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 3.%%% 'ZX-81 Computer Programmer:'%%% 3 is prime, Out of Memory.%%% 'Pentium owner:'%%% 3 is prime, 5 is prime, 7 is prime, 8.9999978 is prime...%%% 'GNU programmer:'%%% % prime%%% usage: prime [[ 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]] [[--expressionscript]] [[--filescript-file]] -nV --quiet --silent --version -e script --catenate --concatenate || c --create || d --diff --compare || r --append || t --list || u --update |] prime: you must specify exactly one of the r, c, t, x, or d options For more information, type "prime --help%%% 'Unix programmer:'%%% 3 is prime, 5 is prime, 7 is prime, ...%%% Segmentation fault, Core dumped.%%% 'Computer programmer:'%%% 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:%%% 3 is prime, 5 is prime, 7 is prime, 9 is ... 3 is prime, 5 is prime, 7 is prime, 9 is ... 3 is ...%%% Um, right. Okay, how about this:%%% 3 is not prime, 5 is not prime, 7 is not prime, 9 is not prime...%%% So much for the beta releases. Ship this:%%% 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 ===="%%%

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Coming soon:%%% 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:'%%% 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?%%% 'Minesweeper addict:'%%% 1 is green, 2 is blue, 3 is orange, 4 is red...%%% '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:'% 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):'%%% 3 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):'%%% 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:'%%% 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 ====?%%%

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'Mid-level manager:'%%% 3 is prime, 5 is prime, 7 is prime, 9 is... Who can I delegate this to ?%%% 'Lawyer:'%%% 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 ...%%% 'Lawyer(2):'%%% It depends on what the meaning of is is.%%% 'Salesman:'%%% 3 is prime, 5 is prime, 7 is prime, and with 9 you get five excellent primes for the price of three ====%%%

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'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.%%% 'Nixon:'%%% Put nine on the enemies list. I'm gonna get that number.%%% 'New Yorker:'%%% 3 is prime, 5 is prime, 7 is prime, 9 is ... NONE OF YOUR DAMN BUSINESS====%%%

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'New Jersey:'%%% What do I look like to youse? Google?%%% 'rec.humor poster:'%%% 3 is prime, 3 is prime, 3 is prime, 3 is prime%%%