464801domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of n-node rooted labeled trees with deg <= 4 at root and outdegree <= 2 elsewhere.at n=18A036661Number of (w,x,y,z) with all terms in {1,...,n} and w^2<=x^2+y^2+z^2.at n=27A212093Prime numbersat n=38820