Sorri, example for p = 2 sqrt(A000040(2) + A141468(2)) = sqrt(3 + 1) = sqrt 4 = 2 = a(1) example for p = 3 sqrt(A000040(3) + A141468(3)) = sqrt(5 + 4) = squrt 9 = 3 = a(2) example for p = 189 sqrt(A000040(189) + A141468(189)) = sqrt(1129 + 240) = sqrt 1369 = 37 = a(3) What is the next one ? Best regards, JSG