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Old 2008-12-07, 15:24   #397
Flatlander
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Quote:
Originally Posted by 10metreh View Post
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
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Old 2008-12-07, 15:46   #398
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Do I like Google? A very hard question to answer.
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Old 2008-12-07, 17:08   #399
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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
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Old 2008-12-07, 17:35   #400
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Quote:
Originally Posted by mart_r View Post
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.
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Old 2008-12-08, 18:49   #401
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Smile permutable prime
1111111111111111111 is a permutable prime
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Old 2008-12-08, 18:59   #402
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Quote:
Originally Posted by Housemouse View Post
1111111111111111111 is a permutable prime
As are 11111111111111111111111, R317, R1031 etc.
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Old 2008-12-10, 23:41   #403
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Quote:
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1111111111111111111 is a permutable prime
Nope. At least not by Mally's definition in post #394.
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Old 2008-12-11, 00:02   #404
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Quote:
Originally Posted by mart_r View Post
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.
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Old 2008-12-11, 16:54   #405
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I know. It's strange that they used two different numbers.
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Old 2009-10-23, 14:10   #406
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The pair 54 and 56.
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Old 2009-10-27, 12:12   #407
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... is the first...
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