81875

Appears in sequences

• Expansion of (1-5*x-sqrt((1-5*x)^2-4*5*x^2))/(2*5*x^2).at n=6A107265
• a(n) = a(n-1) + 3*a(n-2) - 3*a(n-3) - 2*a(n-4) + 2*a(n-5) for n >= 6, a(0) = 2, a(1) = 4, a(2) = 7, a(3) = 11, a(4) = 18, a(5) = 28.at n=27A289131
• Numbers that are the sum of six fourth powers in seven or more ways.at n=23A345564
• Numbers that are the sum of six fourth powers in exactly seven ways.at n=21A345819