8389137domain: NAppears in sequencesa(n) = 2^n + n^2.at n=23A001580Numbers of the form p^2 + 2^p for p prime.at n=8A097058Numbers of the form a^b+b^a, a and b are primes.at n=16A173056a(n) = Sum_{p|n, p prime} p^sopf(n/p).at n=45A369912