81727domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumbers k such that 2*k + 1 divides 2^(k+1) - 1.at n=34A246648Prime numbers that have a decagonal (10 sides) Voronoi cell in the Voronoi diagram of the Ulam prime spiral.at n=17A257748Number of integer partitions of n without all distinct multiplicities.at n=45A336866Prime numbersat n=7994