94143190994domain: NAppears in sequencesa(n) = 3^n + n^3.at n=23A001585Numbers of the form p^3 + 3^p for p prime.at n=8A097059Numbers of the form a^b+b^a, a and b are odd primes, b > a.at n=10A173055Numbers of the form a^b+b^a, a and b are primes.at n=24A173056Leyland numbers which are products of two distinct primes.at n=18A356423