177546

Appears in sequences

• Number of ways to place 4 nonattacking wazirs on a 4 X n board.at n=12A172230
• Numbers n such that if n = a U b (where U denotes concatenation) then abs(sigma*(a) - sigma*(b)) = abs(sigma*(n) - n), where sigma*(n) is the sum of the anti-divisors of n.at n=23A239687