268435460domain: NAppears in sequencesa(n) = 2^n + 4.at n=28A140504a(0) = 4; for n >= 1, a(n) = 2^n + 4.at n=28A146528a(n) = 4^n + 4.at n=14A178675Numbers that can be represented as both a^x + x and b^y + b, for some a, b, x, y > 1.at n=31A253914Terms of A354169 that are not powers of 2, in order of appearance.at n=26A354680