Message 6768 from Yahoo.Groups.Primeform
Return-Path: <jens.k.a@...> X-Sender: jens.k.a@... X-Apparently-To: primeform@yahoogroups.com Received: (qmail 76405 invoked from network); 28 Dec 2005 01:02:20 -0000 Received: from unknown (66.218.66.172) by m25.grp.scd.yahoo.com with QMQP; 28 Dec 2005 01:02:20 -0000 Received: from unknown (HELO swip.net) (212.247.154.33) by mta4.grp.scd.yahoo.com with SMTP; 28 Dec 2005 01:02:20 -0000 X-T2-Posting-ID: 8DelzKBUtN9zRx0V0PhaBA== X-Cloudmark-Score: 0.000000 [] Received: from [195.82.221.223] (HELO jensathlonxp) by mailfe02.swip.net (CommuniGate Pro SMTP 5.0.2) with SMTP id 67106304 for primeform@yahoogroups.com; Wed, 28 Dec 2005 02:07:08 +0100 Message-ID: <016201c60b49$78386dc0$c7d852c3@jensathlonxp> To: <primeform@yahoogroups.com> References: <dorjto+v4n7@...> Date: Wed, 28 Dec 2005 01:54:53 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2741.2600 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2742.200 X-Originating-IP: 212.247.154.33 X-eGroups-Msg-Info: 1:12:0:0 From: "Jens Kruse Andersen" <jens.k.a@...> Subject: Re: [primeform] Paul Jobling's record palindrome X-Yahoo-Group-Post: member; u=125539524; y=5dxc0BZ-qVxn4kZ8fklyLtvHv4NG1w3Iyx00S80Ya9hpjw X-Yahoo-Profile: jkand71Jean Penné wrote: > I wish also to congrat you, Paul, for this record! > Also I am curious to know how are you selecting your candidates, and > what sieving program are you using (is it NewPGen) ? Congratulations from me too. Paul wrote "I threw the sieve together". As Jim says, it sounds like a custom sieve. I also made one and sieved to 10^12 for the doubly palindromic prime (number of digits is palprime) 10^98689-429151924*10^49340-1. It is the largest existing below 1 million digits: http://listserv.nodak.edu/cgi-bin/wa.exe?A2=ind0405&L=nmbrthry&P=1651 The sieve can handle palindromes of a fixed length, and the form: 100...00M00...001 or 99..99M99...99, for M up to 11 digits. Paul Underwood wrote: > Phil was interested in forming a team to look for near-repdigit > palindromes. It is a pity that it can not be "primeform e-group" -- we > would not be using PFGW. I think "primeform e-group" refers to this primeform list. I guess there is no absolute law saying PFGW must be used. Paul maintains the bio page http://primes.utm.edu/bios/page.php?id=339 If Phil's program only prp tests then PFGW could prove... That would be fine for me in this case where e-group wetware is involved. -- Jens Kruse AndersenMessage 6757 Message 6764 Message 6765 Message 6766 Message 6767 Message 6769