mersenneforum.org  

Go Back   mersenneforum.org > Great Internet Mersenne Prime Search > Math

Reply
 
Thread Tools
Old 2011-02-12, 19:16   #1
Arkadiusz
 
Dec 2009

2710 Posts
Post Hoot discussion - "Beastly primes".

See:
http://oeis.org/draft/A186086
Arkadiusz is offline   Reply With Quote
Old 2011-02-12, 19:31   #2
Arkadiusz
 
Dec 2009

338 Posts
Default

In my opinion, there's a 'big hole' in the definition of beastly primes.
http://oeis.org/A131645
Arkadiusz is offline   Reply With Quote
Old 2011-02-12, 19:34   #3
science_man_88
 
science_man_88's Avatar
 
"Forget I exist"
Jul 2009
Dumbassville

8,369 Posts
Default

Quote:
Originally Posted by Arkadiusz View Post
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
science_man_88 is offline   Reply With Quote
Old 2011-02-12, 19:48   #4
science_man_88
 
science_man_88's Avatar
 
"Forget I exist"
Jul 2009
Dumbassville

8,369 Posts
Default 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.
science_man_88 is offline   Reply With Quote
Old 2011-02-13, 02:08   #5
CRGreathouse
 
CRGreathouse's Avatar
 
Aug 2006

10111001100102 Posts
Default

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
CRGreathouse is offline   Reply With Quote
Old 2011-02-13, 14:42   #6
Christenson
 
Christenson's Avatar
 
Dec 2010
Monticello

24·107 Posts
Default

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!!
Christenson is offline   Reply With Quote
Old 2011-02-13, 17:50   #7
cmd
 
cmd's Avatar
 
"(^r'°:.:)^n;e'e"
Nov 2008
;t:.:;^

3E716 Posts
Default

/\
cmd is offline   Reply With Quote
Old 2011-02-13, 21:41   #8
CRGreathouse
 
CRGreathouse's Avatar
 
Aug 2006

10111001100102 Posts
Default

Quote:
Originally Posted by Christenson View Post
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.
CRGreathouse is offline   Reply With Quote
Old 2011-02-14, 03:39   #9
EdH
 
EdH's Avatar
 
"Ed Hall"
Dec 2009
Adirondack Mtns

1101011100112 Posts
Default

Quote:
Originally Posted by cmd View Post
Neat!
EdH is online now   Reply With Quote
Old 2011-02-14, 06:41   #10
CRGreathouse
 
CRGreathouse's Avatar
 
Aug 2006

134628 Posts
Default

http://oeis.org/A047076
CRGreathouse is offline   Reply With Quote
Old 2011-11-26, 18:04   #11
Arkadiusz
 
Dec 2009

33 Posts
Default

Please help to extend these sequences:
http://oeis.org/A186630
http://oeis.org/A186538
http://oeis.org/A156166
http://oeis.org/A186521
Arkadiusz is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Stockfish game: "Move 9 poll", not "move 2^74,207,281-1 discussion" MooMoo2 Other Chess Games 1 2016-10-25 18:03
Stockfish game: "Move 8 poll", not "move 3.14159 discussion" MooMoo2 Other Chess Games 5 2016-10-22 01:55
Scottish game: "Move 6 poll", not "move -1 discussion" MooMoo2 Other Chess Games 0 2016-10-11 16:30
Stockfish game: "Move 4 poll", not "move 100 discussion" MooMoo2 Other Chess Games 0 2016-09-28 19:51
Stockfish game: "Move 2 poll", not "move 2 discussion" 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.