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2008-12-07, 15:24   #397
Flatlander
I quite division it

"Chris"
Feb 2005
England

31·67 Posts

Quote:
 Originally Posted by 10metreh Why has this thread been inactive for so long? I think it is great. 233 is the smallest prime factor of 2^29-1. 4897256
The other problem is that it's all too easy to just type the number into Google to find something :
[URL="http://www.research.att.com/%7Enjas/sequences/A006494"]http://www.research.att.com/~njas/sequences/A006494[/URL]

20120121122515626145776622735224615338815731191617

 2008-12-07, 15:46 #398 10metreh     Nov 2008 91216 Posts Do I like Google? A very hard question to answer.
 2008-12-07, 17:08 #399 mart_r     Dec 2008 you know...around... 60910 Posts None of us has yet managed to fathom out what's so special about 20120121122515626145776622735224615338815731191617, though we already tried hard to reveal this mystery. For those who like math movies: 941432434315126593210548723904868285129134748760276719592346023858295830472501652325259296925727655364363462727 18401201264314754632945012784726484107562234789626728592858295347502772262646456217613984829519475412398501
2008-12-07, 17:35   #400
10metreh

Nov 2008

2×33×43 Posts

Quote:
 Originally Posted by mart_r None of us has yet managed to fathom out what's so special about 20120121122515626145776622735224615338815731191617, though we already tried hard to reveal this mystery.
I myself think it's a random-ish number with a few possibly special elements, such as the large number of double digits and the string of 1s in binary.

 2008-12-08, 18:49 #401 Housemouse     Feb 2008 25 Posts permutable prime 1111111111111111111 is a permutable prime
2008-12-08, 18:59   #402
10metreh

Nov 2008

232210 Posts
You missed a few out!

Quote:
 Originally Posted by Housemouse 1111111111111111111 is a permutable prime
As are 11111111111111111111111, R317, R1031 etc.

2008-12-10, 23:41   #403
wblipp

"William"
May 2003
New Haven

44708 Posts

Quote:
 Originally Posted by Housemouse 1111111111111111111 is a permutable prime
Nope. At least not by Mally's definition in post #394.

2008-12-11, 00:02   #404
Batalov

"Serge"
Mar 2008
Phi(4,2^7658614+1)/2

918410 Posts

Quote:
 Originally Posted by mart_r None of us has yet managed to fathom out what's so special about 20120121122515626145776622735224615338815731191617, though we already tried hard to reveal this mystery. For those who like math movies: 941432434315126593210548723904868285129134748760276719592346023858295830472501652325259296925727655364363462727 18401201264314754632945012784726484107562234789626728592858295347502772262646456217613984829519475412398501
Yes, a truly remarkable one.

The 216-digit number which Max hand-writes on paper (different from the (YOUR!) 218-digit number displayed on-screen by Euclid) is:
884509627386359275033751967 943067599621731590401694134 434007629683591574337516791 197615733475195375920401694 343151239621353184932676605 800621596380716399501371459 954387507655892533875618750 354029981152863950711207613.

The piece of paper he writes it on has "Only God is Perfect" at the bottom.

 2008-12-11, 16:54 #405 mart_r     Dec 2008 you know...around... 11418 Posts I know. It's strange that they used two different numbers.
 2009-10-23, 14:10 #406 Flatlander I quite division it     "Chris" Feb 2005 England 31×67 Posts The pair 54 and 56.
 2009-10-27, 12:12 #407 Flatlander I quite division it     "Chris" Feb 2005 England 31·67 Posts ... is the first...

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