252181domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form 2*n^2 + 70*n + 33.at n=21A217499E.g.f.: (cos(x) + sin(x)*exp(x)) / (cos(x)*exp(x) - sin(x)).at n=10A245116Prime numbersat n=22218