847322163875domain: NAppears in sequencesa(n) = 2^n + 3^n.at n=25A007689Expansion of (1 - 3*x + x^2)/((1-2*x)*(1-3*x)).at n=26A085281a(n) = 3^(n^2) + 2^(n^2).at n=5A120800a(n) = 2^(2*n+1) + 3^(2*n+1).at n=12A138233Centered cube numbers: (n+1)^25 + n^25.at n=2A194553