66649

Appears in sequences

• Number of rooted toroidal maps with 2 faces and n vertices and without separating cycles or isthmuses.at n=9A006422
• Numbers x such that sigma(x) + sigma(R(x)) = sigma(x + R(x)), where R(x) is the digit reversal of x and sigma(x) is the sum of the divisors of x.at n=32A246487