33241289domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of compositions of 6*n into parts 1 and 6.at n=12A371125a(n) = Sum_{k=0..floor(n/2)} binomial(3*n-5*k,k).at n=24A373638a(n) = Sum_{k=0..floor(n/3)} binomial(2*n-5*k,k).at n=36A373639Prime numbersat n=2045568