135731domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that remain prime through 5 iterations of function f(x) = 2x + 9.at n=11A023334Expansion of Product_{k>=1} (1 + x^k - x^(3*k)) / (1 - x^k).at n=33A266650Prime numbersat n=12647