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 May 5th, 2017, 02:17 AM #11 Math Team     Joined: Jul 2011 From: North America, 42nd parallel Posts: 3,232 Thanks: 189 That was an excellent explanation Mon Ami. I get it now. I broke out the French in gratitude Denis
 May 5th, 2017, 02:33 AM #12 Math Team     Joined: Jul 2011 From: North America, 42nd parallel Posts: 3,232 Thanks: 189 However ... $101 \ \$ is the mirror of $\ \ 101 \ \$ but it is also the $\ \ 25th \ \$ prime. The mirror of $\ \ 25 \ \$ is $\ \ 52 \ \$ but the $\ \ 52nd \ \$ prime is not $\ \ 101$ ???
 May 5th, 2017, 03:47 AM #13 Global Moderator   Joined: Dec 2006 Posts: 16,947 Thanks: 1255 It wasn't asserted that 101 is interesting. I would guess that there are further interesting primes and that they are palindromic. After all, one can easily get "close": 191 is palindromic, but is the 43rd prime, where 43 isn't palindromic (but 44 is).
 May 5th, 2017, 04:03 AM #14 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 9,076 Thanks: 622 101 is 26th prime; you're not including "2"? I don't know what is meant with these palindromes... That's why I skipped them. Perhaps the position number has to be also a palindrome: like, if 101 was 22nd prime. However, no such cases with 3digit primes. There are 15 of those critters: 101,131,151,181,191,313,353, 373,383,727,757,787,797,919,929 A plus tard Monsieur L'Agent! Note: sorry Skip, didn't see your post... Last edited by Denis; May 5th, 2017 at 04:19 AM. Reason: Add note
May 5th, 2017, 12:07 PM   #15
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Quote:
 Originally Posted by Denis 101 is 26th prime; you're not including "2"?
Ooops ! missed a prime.

I find the OP's question interesting , wonder if he will be back to clarify?

May 5th, 2017, 12:22 PM   #16
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Quote:
 Originally Posted by agentredlum Ooops ! missed a prime.
To the corner...for 11 minutes...

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