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Old 2017-04-17, 12:03   #5
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Jul 2009

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Originally Posted by WhoCares View Post
I think u get me wrong. I said only n is divisible by 11.
okay so which number's totient value is 11 ( if it can even happen edit:turns out it can't via istotient in PARI/gp) ? that should help you eliminate/prove a few factors of 10^n+7.

Last fiddled with by science_man_88 on 2017-04-17 at 12:04
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