192991domain: NPropertiesPrimalityPrimeyesAppears in sequencesThe number of tilings of a triangular shape T_n with n rectangles identifying all tilings which use the same rectangular shapes.at n=18A247139Primes whose trajectories under the map x -> A039951(x) enter the cycle {83, 4871} (conjectured).at n=28A252812Prime numbersat n=17415