# Thread: urgent pls help

1. ## urgent pls help

can you please help?

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

thx

2. Originally Posted by marlen19861@hotmail.com
can you please help?

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

thx
$n^2- 1= (n-1)(n+1)$ so there is no perfect square one more than a prime, so no twin primes whose mid term is a perfect square.

I think you can do something similar for triangular numbers. I have no idea at all about perfect numbers.