theorem
  22 satisfies_Sierpinski_problem_86
  proof
    reconsider a = 3 as Prime by XPRIMES1:3;
    reconsider b = 7 as Prime by XPRIMES1:7;
    reconsider c = 23 as Prime by XPRIMES1:23;
    take a,b,c;
    thus thesis by Th57;
  end;
