- Thread starter
- Admin
- #1
- Feb 14, 2012
- 3,963
Show that for an odd integer $m\ge 5$,
$\displaystyle {m\choose 0} 5^{m-1}-{m\choose 1} 5^{m-2}+{m\choose 2} 5^{m-3}-\cdots+{m\choose m-1} $
is not a prime number.
$\displaystyle {m\choose 0} 5^{m-1}-{m\choose 1} 5^{m-2}+{m\choose 2} 5^{m-3}-\cdots+{m\choose m-1} $
is not a prime number.