Even Numbers and Primes

Discussions focus on properties of even and odd numbers, the fact that 2 is the only even prime, powers of 2, perfect numbers, and basic number theory misconceptions.

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Keywords

OP i.e odd number numbers sum digits mod integer integers proper proof

Sample Comments

brokensegue • Dec 13, 2019 • View on HN

They thought all even numbers are powers 2

m3kw9 • May 3, 2023 • View on HN

Is like asking if pi is even or odd

zarzavat • Dec 31, 2025 • View on HN

Presumably the number they are doing is less than 2 otherwise this is disgusting.

DrDroop • Jul 8, 2023 • View on HN

const THE_LEFT_HANDED_IDEAL_FOR_THE_EVEN_NUMBERS_OF_THE_NATURAL_NUMBERS_UNDER_MULTIPLICATION = 2

mcguire • Jun 3, 2021 • View on HN

A proof of existence for any number?

st_goliath • Apr 12, 2021 • View on HN

"Any integer can be expressed uniquely as a sum of unique powers of even primes."

ezequiel-garzon • Sep 22, 2016 • View on HN

Plenty of even perfect numbers. Find some odd ones!

ccppurcell • Mar 27, 2023 • View on HN

I wasn't asking for complex mathematics, just for the basic understanding that an even number greater than 2 can't be prime.

D3 • Oct 10, 2012 • View on HN

At least it's a nice even number.

PuercoPop • Dec 2, 2012 • View on HN

You could say an even number, which includes zero for that effect.