1. The problem statement, all variables and given/known data if p and p+2 are twins prime and p+1 is triangular number, then find all twin primes. 2. Relevant equations Tn is a triangular number if Tn=1+2+...+n = n(n+1) / 2 3. The attempt at a solution p+1 = n(n+1) / 2 because p+1 is a triangular number p , p+1 , p+2 are terms in succession p is prime, p+2 is prime so 3 divide p+1 --> 3/p+1 sure the p+1 is even number because is between of two prime so p+1 has the form 6k i don't how to continue.. can someone help me??