270037domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of nonempty subsets S of {1,2,3,...,n} that have the property that no element x of S is a nonnegative integer linear combination of elements of S-{x}.at n=31A103580a(n) is the number of unlabeled rank-3 graded lattices with 5 coatoms and n atoms.at n=24A322600Prime numbersat n=23646