156719domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrime numbers that have a decagonal (10 sides) Voronoi cell in the Voronoi diagram of the Ulam prime spiral.at n=30A257748Expansion of e.g.f. (1 + 2*x) * exp(x) / (sec(x) + tan(x)).at n=11A337444Prime numbersat n=14414