682080

Appears in sequences

• Number of invertible 2 X 2 matrices mod n.at n=28A000252
• Number of 2 X 2 matrices with entries mod n and nonzero determinant.at n=28A005353
• a(n) = n*(n-1)*(n-2)^2.at n=28A047927
• Composite n added to sum of its prime factors is nextprime(n).at n=6A050765
• Orders of the finite groups GL_2(K) when K is a finite field with q = A246655(n) elements.at n=15A059238
• Number of the Lipschitz quaternions in a reduced system modulo n.at n=28A227499
• Order of GL_2(p), the general linear group over F_p, where p runs through the primes.at n=9A244509
• Order of the finite groups GL(m,q) [or GL_m(q)] in increasing order as q runs through the prime powers.at n=19A335384
• Least k whose set of divisors contains exactly n quadruples (x, y, z, w) such that x^3 + y^3 + z^3 = w^3, or 0 if no such k exists.at n=28A337098