531485

Appears in sequences

• a(n) = smallest number that leads to a new cycle under the base-3 Kaprekar map of A164993.at n=22A165009
• G.f. = b(2)^2*b(4)/(2*x^5+x^4-2*x^3-x^2-x+1), where b(k) = (1-x^k)/(1-x).at n=20A266370
• Number of vertices formed inside a square with edge length 1 by the straight line segments mutually connecting all vertices and points that divide the sides into segments with lengths equal to the Farey series of order n = A006842(n,k)/A006843(n,k), k = 1..A005728(n).at n=6A358887