177013domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form (4*k + 1)^2 + (4*k + 2)^2 where k=0,1,2,3,...at n=21A087871Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n and having k UDUDU's (n >= 0; 0 <= k <= n-2 for n >= 2).at n=48A128753Prime numbersat n=16089