16. Any composite (and only composite) odd number can be represented as the sum of consecutive odd numbers. Which even composite numbers have the same property?
16. $(2 a+1)+(2 a+3)+\ldots+(2 a+2 n-1)=2 k+$ $+1=n_{1} n_{2},(2 a+n) n=n_{1} n_{2}$, we can take $n=n_{2}$, if $n_{2}<n_{1}$.

Among the even composite numbers, those that have this property are multiples of 4.