Message 10561 from Yahoo.Groups.Primeform
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Date: Mon, 27 Sep 2010 17:27:46 -0000
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From: "djbroadhurst" <d.broadhurst@...>
Subject: Re: Palindromic song-and-dance
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--- In primeform@yahoogroups.com,
Phil Carmody <thefatphil@...> wrote:

> Consider palindromic numbers which consist of the concatenation
> of the sequence of *palindromic* numbers from 1 up to a middle
> term, and then back down to 1 again.

OK, boss!

> Let us call such numbers "P*l*nd*ch* numbers".

If you insist. But please use r**m*n**n asterisks in future,
as previously agreed for such concatenations.

There ain't no p*l*n*d*ch* prime with middle < 75557,
by which time we are up to 7869 decimal digits
for the 854th p*l*n*d*ch* number, if I did not boob.

So I guess they are hard to find, because of small
divisors, like 3 and 11, at small middles, and
then the explosion of size.

> As always, brains first - CPUs later,
> and explain your work, please.

Sorry boss: I was too busy to use my brain.

D*v*d


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