Hoot discussion - "Beastly primes".

Arkadiusz · 2011-02-12, 19:16

See:
http://oeis.org/draft/A186086

Arkadiusz · 2011-02-12, 19:31

In my opinion, there's a 'big hole' in the definition of beastly primes.
http://oeis.org/A131645

science_man_88 · 2011-02-12, 19:34

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.

science_man_88 · 2011-02-12, 19:48

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.

CRGreathouse · 2011-02-13, 02:08

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.

Christenson · 2011-02-13, 14:42

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!!

cmd · 2011-02-13, 17:50

/\

CRGreathouse · 2011-02-13, 21:41

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.

EdH · 2011-02-14, 03:39

Quote:

Originally Posted by cmd

/\

Neat!

CRGreathouse · 2011-02-14, 06:41

http://oeis.org/A047076

Arkadiusz · 2011-11-26, 18:04

Please help to extend these sequences:
http://oeis.org/A186630
http://oeis.org/A186538
http://oeis.org/A156166
http://oeis.org/A186521

2011-02-12, 19:16	#1
Arkadiusz Dec 2009 27₁₀ Posts	Hoot discussion - "Beastly primes". See: http://oeis.org/draft/A186086

2011-02-13, 02:08	#5
CRGreathouse Aug 2006 5985₁₀ 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

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2011-02-12, 19:31	#2
Arkadiusz Dec 2009 3³ Posts	In my opinion, there's a 'big hole' in the definition of beastly primes. http://oeis.org/A131645

2011-02-13, 14:42	#6
Christenson Dec 2010 Monticello 1795₁₀ 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:.:;^ 3³×37 Posts	/\

2011-02-14, 06:41	#10
CRGreathouse Aug 2006 1011101100001₂ Posts	http://oeis.org/A047076

2011-11-26, 18:04	#11
Arkadiusz Dec 2009 1B₁₆ Posts	Please help to extend these sequences: http://oeis.org/A186630 http://oeis.org/A186538 http://oeis.org/A156166 http://oeis.org/A186521