146701domain: NPropertiesPrimalityPrimeyesAppears in sequencesG.f. A(x) satisfies: A(x) = 1 - x * A(x/(1 - x)) / (1 - x)^3.at n=12A346053Number of nonempty subsets of {1..n} whose elements have a square average.at n=24A369391Prime numbersat n=13567