IS 143 A PRIME #?
2007-02-07 13:27:34 · 6 answers · asked by ♥ juicy couture ♥ 4 in Education & Reference ➔ Homework Help
PLZ HELP!!!! I REALLY NEED IT!!!
2007-02-07 13:32:30 · update #1
no, it is not...if you divide 143 by 11, you get 13...thus, it's not a prime number.
2007-02-07 13:32:39 · answer #1 · answered by DeceptiConservative 4 · 0⤊ 0⤋
Since 143 is less than 144, which is 12 squared,
You only need to check for factors less than 12.
2,4,6,8,10 are not factors, since it's off
3,9 are not factors since the digits do not add up to a number divisible by 3.
5 is not a factor, since 143 doesn't end in 5 or 0
that leaves 7 and 11.
Try it, You'll see that 143 is 13*11.
I should have known this because (x^2-1) can always be expressed as (x+1)*(x-1)
2007-02-07 21:33:22 · answer #2 · answered by firefly 6 · 0⤊ 0⤋
Prime no. means no other number can go into it except for one...using this definition is 143 prime
2007-02-07 21:39:16 · answer #3 · answered by Carlene W 5 · 0⤊ 0⤋
go to this web and it got alist of prime numbers hope i helped http://primes.utm.edu/lists/small/1000.txt
2007-02-07 21:35:58 · answer #4 · answered by dona a 2 · 0⤊ 0⤋
nope...i dont think so... *scratches head* *blinks*
DAMMIT MATH FOLLOWS ME AROUND EVERYWHERE I GO!
Well, its been fun but i got up @ five AM today so i pretty muh have bettr things to do... *SHNORE*
2007-02-07 21:33:13 · answer #5 · answered by lol4lisa 1 · 0⤊ 0⤋
no, it is not prime
2007-02-07 22:00:18 · answer #6 · answered by Anonymous · 0⤊ 0⤋