219450

Appears in sequences

• a(n) = n*(2*n-1)*(2*n+1).at n=38A035328
• Triangle read by rows, the Bell transform of the quartic factorial numbers A007696(n+1) without column 0.at n=32A049029
• Triangle T(n,m)= Sum_{i=0..n} L'(n,i)*Product_{j=1..m} (i-j+1), read by rows.at n=31A059114
• Numbers k such that phi(k) < k/5.at n=28A066765
• Numbers n that raised to the powers from 1 to k (with k>=1) are multiple of the sum of their digits (n raised to k+1 must not be a multiple). Case k=11.at n=33A135196
• Triangle, read by rows, T(n, k) = Sum_{j=0..k} (n+k)!/((n-j)!*(k-j)!*j!).at n=25A176080
• Number of (w,x,y,z) with all terms in {1,...,n} and w<=2x and y>3z.at n=37A212514
• Smallest fixed points (>0) of the base-2*n Kaprekar map.at n=37A319839
• Numbers with a record number of deficient divisors.at n=33A335542