173699domain: NPropertiesPrimalityPrimeyesAppears in sequencesEngel expansion of gamma^2, (gamma is the Euler-Mascheroni constant A001620) = 0.333178.at n=19A059190Where records occur in A144261.at n=15A144364Primes p such that p+-2 and p+-4 are semiprimes.at n=33A266845Prime numbersat n=15807