73274

Appears in sequences

• Number of finite sequences b with b(0) = 1, b(i+1) = b(i)+d where d|b(i), ending with n.at n=25A122205
• Number of (w,x,y,z) with all terms in {1,...,n} and w^2<x^2+y^2+z^2.at n=17A212092
• Number T(n,k) of equivalence classes of ways of placing k 2 X 2 tiles in an n X 7 rectangle under all symmetry operations of the rectangle; irregular triangle T(n,k), n>=2, 0<=k<=3*floor(n/2), read by rows.at n=48A238555
• Number T(n,k) of equivalence classes of ways of placing k 2 X 2 tiles in an n X 8 rectangle under all symmetry operations of the rectangle; irregular triangle T(n,k), n>=2, 0<=k<=4*floor(n/2), read by rows.at n=47A238557
• a(n) = Sum_{k=1..n} k^2 * floor(n/k)^3.at n=28A350124