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May 5th, 2017, 02:17 AM   #11
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That was an excellent explanation Mon Ami. I get it now.

I broke out the French in gratitude Denis

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May 5th, 2017, 02:33 AM   #12
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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$

???
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May 5th, 2017, 03:47 AM   #13
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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).
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May 5th, 2017, 04:03 AM   #14
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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
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May 5th, 2017, 12:07 PM   #15
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Quote:
Originally Posted by Denis View Post
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?

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