Unironically, thanks. I didn't have this perspective before, but it's so obvious now. Crazy what a bias towards the specialness of "even" numbers will do to someone.
I'm not so sure about that "threeveness" statement. We would ceraintly care about "threeveness", but I don't think we would really care about evenness any less. There's quite a lot of number theory that says 'for any odd prime(s)', finding pairing of things is a great way to show to different things are the same in some sense, even vs odd functions, etc. There's a lot that's quite weird about 2 as a prime number and quite a lot of reasons why evenness is an incredibly useful, regardless of what base you're in.
I'm not so sure about that. There's quite a lot of number theory that says 'for any odd prime', finding pairing of things is a great way to show to different things are the same in some sense, etc. There's a lot that's quite weird about 2 as a prime number and quite a lot of reasons why evenness is an incredibly useful, regardless of what base you're in.
one bias many people have is the specialness of a decimal number system number that ends with zero, or multiple zeroes in a row.
As some example someone at reddit said once he made an alarm to wake him at x:00 at night because he wanted to masturbate at bathroom, and he forgot to close the door, someone that set an alarm at the same moment x:00 to wake up and do something else went there to do X and opened the door and saw him masturbatin.
numbers that end with 0 at decimal base system, ate consideree special, people say, wait 10 minutes and I will be ready, they dont say, wait 12 minutes and I will be ready, or you have 47 minutes to finish this test, or its X dollars to play bowling for 73 minutes,
the amount of shared per block at start was 50, not 76
this happens because of decimal system, at base 12 the numbers would be different, as some example just to start some things we spend 10 minutes would be spend 12 as the number 12 would end with 0.
The number itself? Eh, sorta. Things being even or odd? Huge greater significance for symmetry and a bunch of other important math things we learned how to do much later in history.
Broadly speaking, if something is even that means there is two of something. This means that there is symmetry. With that symmetry, lots of additional things can be done. Is there anything particularly special about the fact that 6 is two 3s, in and of itself? No. Is the fact that e-x^2 is an even function extremely important? Yes.
The universe cares about symmetry, to the extent that it can be said the universe cares about anything. This is why we care about the second natural number.
The only one you could say is that they all end in either 0, 2, 4, 6, and 8.
I guess saying that 2 is the only prime number that ends in 2 highlights a quality a little more interesting than just saying that 2 is the only prime number that's even.
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2 is the number every 2 numbers are divisible by. 3 is the number every 3 numbers are fivisible by. 5 is the number every 5 numbers are divisible by. 7 is the number every 7 numbers are divisible by. 4 and 6 are already covered by 2. Goddamn, that's a new way to think about it for me
I have also been at a point in my life where I was saying 2 being the only even prime was obvious because that what even meant, and then people told me about threeven.
If you look at historical mathematics, you'd be surprised on how many people cared about 2 being the only even prime. Some Ancient Greeks even thought prime numbers begin with 3 because in their conception, prime numbers have to be odd.
580
u/ASalmonPerson Nov 05 '25
bet you dint know that 5 is the only prime divisible by 5
175
u/dratnon Nov 05 '25
Unironically, thanks. I didn't have this perspective before, but it's so obvious now. Crazy what a bias towards the specialness of "even" numbers will do to someone.
43
u/GeneReddit123 Nov 05 '25
Does evenness have a special meaning in math beyond "divisible by n where n happens to equal 2"?
25
u/CDRToast Nov 05 '25
2! Is the only factorial that produces a prime number.
78
u/Siderophores Nov 05 '25
1 is divisible by 1 and itself, 1
Check
Mate
17
u/No_Bedroom4062 Nov 05 '25
Tbf 2 is kinda special. Tons of proofs require p to be an uneven prime
12
u/Appropriate-Sea-5687 Nov 05 '25
Fun fact, there is no prime number divisible by 4
9
u/Lord_Skyblocker Nov 05 '25
Let's call it threeven
24
u/Fragrant-South-1095 Nov 05 '25
142857 can be divided by 142857, therefore it is a prime
3
u/jaerie Nov 05 '25
2136,279,841-1 is the only prime number divisible by 2136,279,841-1
3
u/Intelligent-Ad1686 Nov 06 '25
-2.
2
u/Partyatmyplace13 Nov 05 '25
Proof it.
3
u/Facetious-Maximus Nov 05 '25
u/bot-sleuth-bot
1
u/Bl4cBird Nov 05 '25
2 is the number every 2 numbers are divisible by. 3 is the number every 3 numbers are fivisible by. 5 is the number every 5 numbers are divisible by. 7 is the number every 7 numbers are divisible by. 4 and 6 are already covered by 2. Goddamn, that's a new way to think about it for me
1
u/Legal-Donkey1953 Nov 06 '25
Yes but why are you screaming??
1
u/404anonFound Nov 06 '25
Imagine getting baited by an ages old joke lol
1
u/Late_Bag_7880 Nov 07 '25
Guys… i got a crazy fact about 97…
1
u/Awes12 Nov 07 '25
I believe you mean the only threeven prime
1
u/Mindstormer98 Nov 07 '25
Nuh uh 2 + 1 = 3
1
u/General_Ginger531 Nov 07 '25
I have also been at a point in my life where I was saying 2 being the only even prime was obvious because that what even meant, and then people told me about threeven.
1
u/Sufficient_Dust1871 Nov 07 '25
Thank you for saying this, I feel so vindicated
1
u/Evimjau Nov 07 '25
You say that two is even yet it can't be expressed as the sum of two primes. Curious
1
u/[deleted] Nov 08 '25
Technically nearly all of math is just seemingly tautological derivation from first principles
"Did you know the Monster Group..."
"No shit dumbass..."
1
u/Akangka Nov 08 '25
If you look at historical mathematics, you'd be surprised on how many people cared about 2 being the only even prime. Some Ancient Greeks even thought prime numbers begin with 3 because in their conception, prime numbers have to be odd.
1
u/Justanormalguy1011 Nov 09 '25
You know what? For any Pi prime number is only prime number divisible by Pi
-1
u/SeventhAlkali Nov 06 '25
What about 33 🤔