%N Solutions to lcm(n, tau(n)) = 2n which are neither prime nor twice a prime, where tau(k) = d(k) is the number of divisors of k.
%H Charles R Greathouse IV, <a href="/A077646/b077646.txt">Table of n, a(n) for n = 1..10000</a>
%F Composite solutions to A009530(x)=2x which are not twice a prime.
%e n=63: d(n) = tau(n) = 6, lcm(63,6) = 126 = 2n.
%o (PARI) is(n)=!isprime(if(n%2,n,n/2)) && lcm(n,numdiv(n))==2*n \\ _Charles R Greathouse IV_, Oct 28 2013
%Y Cf. A009530, A001747, A000040, A065091.
%A _Labos Elemer_, Nov 18 2002