90173domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form 7*p^2+7*p-1 (with p=prime).at n=10A171138Primes having primitive roots 2, 3, 5, 7, 11, 13, and 17.at n=33A241048Prime numbers that have a decagonal (10 sides) Voronoi cell in the Voronoi diagram of the Ulam prime spiral.at n=19A257748Prime numbersat n=8732