633600

Appears in sequences

• Number of invertible 2 X 2 matrices mod n.at n=32A000252
• a(n) = floor( n*(n+1)*(n+2)*...*(n+6) / (n+(n+1)+(n+2)+...+(n+6)) ).at n=10A032774
• Integer quotients n(n+1)(n+2)...(n+6) / (n+(n+1)+(n+2)+...+(n+6)).at n=9A032776
• Theta series of 20-dimensional lattice L_20 with group 2.M_22.2.at n=7A033288
• Magic products of 5 X 5 multiplicative magic squares.at n=26A111031
• Septuple factorial, 7-factorial, n!7, n!!!!!!!, a(n) = n*a(n-7) if n > 1, else 1.at n=32A114799
• Partial products of successive terms of A017029; a(0)=1.at n=5A144827
• Define the array k(n,x) = number of m such that tau(gcd(n,m)) is x where m runs from 1 to n. Also define h(n,x) = Sum_{d|n : tau(d) = x} d. The sequence contains numbers n such that k(n,x)*x = h(n,x) has at least one solution x.at n=31A197099
• Number of the Lipschitz quaternions in a reduced system modulo n.at n=32A227499
• Sequence A255412 sorted into ascending order, with duplicates removed.at n=32A254035
• a(n) = A000203(A255334(n)).at n=38A255412