700643domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(0) = a(1) = a(2) = 1, a(n) = largest prime <= a(n-1) + a(n-2) + a(n-3).at n=24A126273Irregular primes with irregularity index five.at n=7A219333Prime numbersat n=56594