722500

Appears in sequences

• Numbers that are the sum of 2 nonzero squares in exactly 7 ways.at n=12A025290
• Numbers that are the sum of 2 distinct nonzero squares in exactly 7 ways.at n=14A025308
• Square perimeters of primitive Pythagorean triangles.at n=29A120089
• Squares that remain squares prefixed with a 2.at n=5A167036
• Squares that remains a square when some single digit is inserted in front of its decimal expansion.at n=34A167045
• Numbers k such that (65*k)^2 can be represented in exactly 4 ways as the sum of a positive square and a positive fourth power.at n=15A346594
• a(n) = sigma_2(n)^2.at n=23A356533
• a(n) = sigma_2(n)^2.at n=25A356533
• Perfect powers in A329150.at n=32A361821
• Integers k such that k = Sum k/(p_i + j), where p_i are the prime factors of k (with multiplicity). Case j = 3.at n=24A380924