699796

Appears in sequences

• 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=13A202386
• Nonpalindromic positive integers k such that the absolute value of k^2 - reverse(k)^2 is a square.at n=33A256515
• Numbers k = a^2 + b^2 such that reversal(k) = a^2 - b^2 for a > b > 0, where reversal is A004086.at n=0A332850