38733domain: NAppears in sequencesPrime(a(n)) + ... + prime(a(n)+3) is a square = A051395(n)^2.at n=27A072849a(n)=(1/2)*sum(i=0,n,rad(binomial(n,i))) where rad(k)=A007947(k).at n=17A098426G.f. A(x) satisfies: A(x) = x + x^2 * exp(2 * Sum_{k>=1} (-1)^(k+1) * A(x^k) / k).at n=13A345243