Numbers of the form m*(2^k-1), where m = 2^(k-1)*(2^k-1) is a perfect number (A000396).

A181711

Numbers of the form m*(2^k-1), where m = 2^(k-1)*(2^k-1) is a perfect number (A000396).

Terms

    a(0) =18a(1) =196a(2) =15376a(3) =1032256a(4) =274810802176

External references