# urgent pls help

• November 4th 2008, 07:55 AM
marlen19861@hotmail.com
urgent pls help

Find all twin primes p, p+2 whose mid term p+1 is i) Triangular ii) Perfect square iii) perfect

thx
• November 4th 2008, 09:11 AM
HallsofIvy
Quote:

Originally Posted by marlen19861@hotmail.com
$n^2- 1= (n-1)(n+1)$ so there is no perfect square one more than a prime, so no twin primes whose mid term is a perfect square.