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:
Divisible by 7
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2007-05-13, 21:14
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davar55
May 2004
New York City
108B
_{16}
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Divisible by 7
Show that 2222
^{5555}
+ 5555
^{2222}
is divisible by 7.
More generally, when is a
^{b}
+ b
^{a}
prime?
(This part I don't have a completely general answer to.)
davar55
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