71555

Appears in sequences

• Take an n X n square grid of points in the plane; a(n) = number of ways to divide the points into two sets using a straight line.at n=21A114043
• Nonpalindromic numbers m such that the difference between the square of m and the square of the reversal of m is itself a perfect square. Numbers ending in 0 are excluded.at n=5A202386
• Nonpalindromic positive integers k such that the absolute value of k^2 - reverse(k)^2 is a square.at n=14A256515