892800

Appears in sequences

• Number of invertible 2 X 2 matrices mod n.at n=30A000252
• Number of 2 X 2 matrices with entries mod n and nonzero determinant.at n=30A005353
• a(n) = n*(n-1)*(n-2)^2.at n=30A047927
• Orders of the finite groups GL_2(K) when K is a finite field with q = A246655(n) elements.at n=16A059238
• Determinant of n-th continuous block of 9 consecutive squares of primes.at n=3A118875
• Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} having k consecutive triples of the form (odd,even,odd) and (even,odd,even) (0<=k<=n-2).at n=40A152877
• Sums of adjacent amicable numbers, a(n) = A063990(2n-1) + A063990(2n).at n=26A161005
• The sum of the two numbers in an amicable pair, A002025(n) + A002046(n).at n=26A180164
• Number of the Lipschitz quaternions in a reduced system modulo n.at n=30A227499
• Order of GL_2(p), the general linear group over F_p, where p runs through the primes.at n=10A244509
• The sum (in nondecreasing order) of the two numbers in an amicable pair.at n=26A259953
• Order of the finite groups GL(m,q) [or GL_m(q)] in increasing order as q runs through the prime powers.at n=20A335384