145801domain: NAppears in sequencesp^2 + (p+2)^2 - 1 where (p,p+2) is the n-th twin prime pair.at n=17A184417G.f. A(x) satisfies: A'(x) = A(B(x)) where B'(x) = A(x) with B(0)=0 and A(0)=1.at n=9A231934