1221074418domain: NAppears in sequencesa(n) = 5^n + n^5.at n=13A001593Numbers of the form p^5 + 5^p for p prime.at n=5A097200Numbers of the form a^b+b^a, a and b are odd primes, b > a.at n=8A173055Numbers of the form a^b+b^a, a and b are primes.at n=21A173056