pure number allowed as username in the useradd command?

[Hiisi]

pe, 2010-12-03 kello 02:04 -0500, Tom H kirjoitti:
> I've always assumed that Linux had the same restrictions but "man 5
> passwd" on my F14 box yields nothing so I've just googled and the only
> restriction that
> http://www.kernel.org/doc/man-pages/online/pages/man5/passwd.5.html
> sets is "It should not contain capital letters". 

Probably it's not a restriction but just a recommendation.
]$ whoami
Sampo

F12, upgraded from F11.
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