883411domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of Dyck n-paths with ascents and descents of length equal to 1 (mod 4).at n=28A023427G.f. satisfies: A(x) = (1 + x*A(x)) * (1 + x^4*A(x)).at n=27A216116Prime numbersat n=70077