Arithmetic progressions of three prime numbers with two primes of the   form $\mathbf{p=x^2+y^2+1}$
  In the present paper we prove that there exist infinitely many arithmetic progressions of three different primes $p_1,p_2,p_3=2p_2-p_1$ such that $p_1=x_1^2 + y_1^2 +1$, $p_2=x_2^2 + y_2^2 +1$. 
S. I. Dimitrov
math.NT