88426domain: NAppears in sequencesa(n) = (15*n^4 + 22*n^3 + 45*n^2 + 14*n) / 24.at n=19A101166a(n) = f(f(f(f(f(n))))), where f(n) is prime(n)-1.at n=13A141139Number of (w,x,y,z) with all terms in {0,...,n} and |w-x|=max{w,x,y,z}-min{w,x,y,z}.at n=25A212755