343750

Appears in sequences

• Expansion of (1-5x)/((1+5x)(1-10x)).at n=6A091883
• Numbers n that are the hypotenuse of exactly 6 distinct integer-sided right triangles, i.e., n^2 can be written as a sum of two squares in 6 ways.at n=15A097219
• a(n) = A247503(A277324(n)).at n=36A284563
• a(n) = A247503(A277324(n)).at n=44A284563