536871753domain: NAppears in sequencesa(n) = 2^n + n^2.at n=29A001580Numbers of the form p^2 + 2^p for p prime.at n=9A097058a(n) = n^d+d^n where d = A013632(n) is the distance to the next prime.at n=28A171240Numbers of the form a^b+b^a, a and b are primes.at n=19A173056