19803868domain: NAppears in sequencesa(n) = n^5 - n^4.at n=29A085538a(n) = p^4*(p-1), where p = prime(n).at n=9A138407Number of solutions to gcd(x^2 + y^2 + z^2 + t^2 + h^2, n) = 1 with x,y,z,t,h in [0,n-1].at n=28A238533List of values q^5-q^4 as q runs through A000961 (that is, 1, primes, and prime powers).at n=16A371195