218750

Appears in sequences

• Triangle of coefficients in expansion of (2+5x)^n.at n=34A013621
• Triangle whose (i,j)-th entry is binomial(i,j)*5^(i-j)*2^j.at n=29A038244
• 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=10A097219
• Triangular array read by rows: row n shows the coefficients of the polynomial p(x,n) constructed as in Comments; these polynomials form a strong divisibility sequence.at n=34A327322