20784

Appears in sequences

• Smaller of Smith brothers.at n=12A050219
• Euler totient function of Cullen numbers (A002064), n*2^n +1.at n=11A056820
• Indices n such that A134204(n) < n.at n=27A133242
• a(n) = 36*n^2 + 2*n.at n=23A158064
• a(n) = n^4 + 4*n.at n=12A180354
• Triangle read by rows, T(n,k) matrix inverse of A256550, for n>=0 and 0<=k<=n.at n=46A256551
• Number of 2 X 2 matrices having entries in {0,1,...,n} and determinant in the closed interval [-n,n] with no entry repeated.at n=20A279063
• Sum of the squarefree parts of the partitions of n into 4 parts.at n=46A309479
• Table read by antidiagonals: T(h,n) is the number of n-step self avoiding walks on a 3D cubic lattice confined inside a box of size h x h x h where the walk starts at one of the box's corners.at n=47A337035
• a(n) = Sum_{k=1..n} (k-1)^n * Sum_{j=1..floor(n/k)} j^2.at n=5A356244