Losanitsch is correct!

[Eric W. Weisstein]

On Thu, 26 Jan 2006, N. J. A. Sloane wrote:

> I found my copy.  The 4th letter is definitely an a, not an s.
>
> Lossnitsch is wrong, in other words.

In the face of overwhelming evidence, the author of MathWorld will make 
the necessary correction ;).

Thanks,
-Eric