Message 10561 from Yahoo.Groups.Primeform

Return-Path: <d.broadhurst@...> X-Sender: d.broadhurst@... X-Apparently-To: primeform@yahoogroups.com X-Received: (qmail 98222 invoked from network); 27 Sep 2010 17:27:53 -0000 X-Received: from unknown (98.137.34.46) by m3.grp.sp2.yahoo.com with QMQP; 27 Sep 2010 17:27:53 -0000 X-Received: from unknown (HELO n40b.bullet.mail.sp1.yahoo.com) (66.163.168.154) by mta3.grp.sp2.yahoo.com with SMTP; 27 Sep 2010 17:27:53 -0000 X-Received: from [69.147.65.171] by n40.bullet.mail.sp1.yahoo.com with NNFMP; 27 Sep 2010 17:27:48 -0000 X-Received: from [98.137.35.12] by t13.bullet.mail.sp1.yahoo.com with NNFMP; 27 Sep 2010 17:27:48 -0000 Date: Mon, 27 Sep 2010 17:27:46 -0000 To: primeform@yahoogroups.com Message-ID: <i7qk6i+a6si@...> In-Reply-To: <920382.262.qm@...> User-Agent: eGroups-EW/0.82 MIME-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable X-Mailer: Yahoo Groups Message Poster X-Yahoo-Newman-Property: groups-compose X-Originating-IP: 66.163.168.154 X-eGroups-Msg-Info: 1:6:0:0:0 X-Yahoo-Post-IP: 80.42.249.92 From: "djbroadhurst" <d.broadhurst@...> Subject: Re: Palindromic song-and-dance X-Yahoo-Group-Post: member; u=35890005; y=Pm5CkajcIZAXh6fYOKVppZXB71hJvmMPzQSzuIdWKqRIP1Wu-gC4 X-Yahoo-Profile: djbroadhurst
--- 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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