250025

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 40.at n=24A031718
• Number of 7 X 7 binary matrices with n ones, with no zero rows or columns, up to row and column permutation.at n=10A056079
• n repeated in decimal representation, but separated by enough zeros that the square has the pattern (n^2)(2n^2)(n^2).at n=24A077431
• a(n) = 625*n^2 + 25.at n=19A157915