mersenneforum.org > Math Hoot discussion - "Beastly primes".
 User Name Remember Me? Password
 Register FAQ Search Today's Posts Mark Forums Read

 2011-02-12, 19:16 #1 Arkadiusz   Dec 2009 2710 Posts Hoot discussion - "Beastly primes".
 2011-02-12, 19:31 #2 Arkadiusz   Dec 2009 338 Posts In my opinion, there's a 'big hole' in the definition of beastly primes. http://oeis.org/A131645
2011-02-12, 19:34   #3
science_man_88

"Forget I exist"
Jul 2009
Dumbassville

8,369 Posts

Quote:
 Originally Posted by Arkadiusz See:
It's doesn't seem as hot as you make it sound and to be honest I think by posting a draft link you've allowed people to spam the OEIS no ?

Also you know you can edit previous sequences no ? so there's no reason to have both of them.

Last fiddled with by science_man_88 on 2011-02-12 at 19:37

2011-02-12, 19:48   #4
science_man_88

"Forget I exist"
Jul 2009
Dumbassville

8,369 Posts
typo

though now that you bring it up there's a typo on Caldwell's page.

Quote:
 A palindromic beastly prime has 666 in the center, 0's surrounding these digits, and 1 or 7 at the end. E.g., 700666007. A non-palindromic beastly prime begins with a 666, followed by 0's, with either a 1 or 7 at the right end. E.g., 6660000000001.

 2011-02-13, 02:08 #5 CRGreathouse     Aug 2006 10111001100102 Posts Heh, looks like the OEIS is spilling out onto the Mersenne forums. (If my handle doesn't make it clear, this is Charles R Greathouse IV, the editor-in-chief who commented on that link.) I'm still unclear on one point. For the palindromic version, are the primes required to start and end with the same digit, or can those be mixed? These would lead to different sequences since, e.g., 10006660007 is prime. Assuming that they must be the same I submitted a b-file with all the terms under a thousand digits. Last fiddled with by CRGreathouse on 2011-02-13 at 02:13
 2011-02-13, 14:42 #6 Christenson     Dec 2010 Monticello 24·107 Posts by the usual definition of palindrome (reads the same forward as backwards), 10006660007 is *NOT* a palindrome. (but you could argue with me that it was a quasi-palindrome, since only the initial or final digit differs from a palindrome). One other problem with these sequences...their OEIS numbers don't involve 666 as substrings!!
 2011-02-13, 17:50 #7 cmd     "(^r'°:.:)^n;e'e" Nov 2008 ;t:.:;^ 3E716 Posts
2011-02-13, 21:41   #8
CRGreathouse

Aug 2006

10111001100102 Posts

Quote:
 Originally Posted by Christenson by the usual definition of palindrome (reads the same forward as backwards), 10006660007 is *NOT* a palindrome.
Agreed, but that need not have any bearing on the rather-arbitrary definition in use here.

2011-02-14, 03:39   #9
EdH

"Ed Hall"
Dec 2009
Adirondack Mtns

1101011100112 Posts

Quote:
 Originally Posted by cmd /\
Neat!

 2011-02-14, 06:41 #10 CRGreathouse     Aug 2006 134628 Posts
 2011-11-26, 18:04 #11 Arkadiusz   Dec 2009 33 Posts Please help to extend these sequences: http://oeis.org/A186630 http://oeis.org/A186538 http://oeis.org/A156166 http://oeis.org/A186521

 Thread Tools

 Similar Threads Thread Thread Starter Forum Replies Last Post MooMoo2 Other Chess Games 1 2016-10-25 18:03 MooMoo2 Other Chess Games 5 2016-10-22 01:55 MooMoo2 Other Chess Games 0 2016-10-11 16:30 MooMoo2 Other Chess Games 0 2016-09-28 19:51 MooMoo2 Other Chess Games 0 2016-09-19 19:56

All times are UTC. The time now is 22:30.

Mon Nov 23 22:30:21 UTC 2020 up 74 days, 19:41, 4 users, load averages: 2.50, 2.42, 2.49

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.