687184

Appears in sequences

• The number of conjugacy classes of invertible n X n matrices over GF(2) which are squares of other such matrices.at n=20A266462
• Numbers x such that there exist two integers 0<x<=y and z>0 such that sigma(x)^2 = sigma(y)^2 = x^2 + y^2 + z^2.at n=16A385356