I read someplace that today is Help a down and out day. So, in an effort to prove my cup of compassion is flowing over don't forget; if you give a man a match, he'll be warm for a minute, but set him on fire, and he'll be warm for the rest of his life.
Who would have thought such a simple little question would bring forth such diverse answers.
Epenthesis saw it this way:
Primes p > 3 = 5+2k
(p^2)-1 = [(5+2k)^2] - 1
= 25 +20k +4k^2 -1
= 24 + 20k + 4k^2
= 4*(6 + 5k + k^2)
= 4*(k + 2)*(k + 3)
so 4*3*2 is a factor of p
Rap on the other hand:
Primacy
All primes are of form 6k+/-1 where k is an integer
p^2-1=(6k+/-1)^2-1
=36k^2+/-12k+1-1=12k(3k+/-1)
if k=1 then 12(4 or 2)|24
if k even then 12k|24
if k odd the (3k+/-1)|2 & 12k|12 so 12k(3k+/-1)|24
NSS Enterprise is a big pile of slock
Mark pointed out:
PRIMES
All primes greater than 3 are of the form p = 4n +/- 1 (they're odd).
(4n +/- 1)^2 - 1 = 16n^2 +/- 8n = 8m for some m.
Therefore, p^2 - 1 is a multiple of 8.
All primes greater than 3 are of the form p = 3n +/- 1 (they're not multiples of 3).
(3n +/- 1)^2 - 1 = 9n^2 +/- 6n = 3m for some m.
Therefore, p^2 - 1 is a multiple of 3.
Therefore, p^2 - 1 is a multiple of 24 (3*8).
For good measure he adds:
SLOCK = rocket
For what it's worth, I have :
This solution relies on showing that p^2 - 1 is a multiple of 2x2x2x3
First expand p^2 - 1 to give:
P^2 - 1 = (p - 1) x (p + 1)
Then consider the terms on the right hand side, firstly since we know that p must be odd p -1 and p + 1 must be even. So we have two of the factors we require.
Additionally since p - 1 and p + 1 effectively form 2 consecutive even numbers one of them must be a multiple of 4 thus we have another of our factors of 2. So far we have 2x2x2, now to get the factor of 3
p - 1, p & p + 1 form three consecutive numbers; in any three consecutive numbers one will be a multiple of 3, we know it is not p which is a multiple of 3, as this is prime, hence either p - 1 or p + 1 is a multiple. Therefore p^2 - 1 has the factors 2, 2, 2 & 3 hence:
p^2 - 1 = 24n
NFL riddle.
TPERR = Tab Perry
Wide Receiver - Cincinnati Bengals
GO Gals!
These were sent to me
.. and I have no idea!
MORCAROTOBELINANING
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tpmerhao