Special whole numbers... - Page 37

Flatlander · 2008-12-07, 15:24

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

10metreh · 2008-12-07, 15:46

Do I like Google? A very hard question to answer.

mart_r · 2008-12-07, 17:08

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

10metreh · 2008-12-07, 17:35

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.

Housemouse · 2008-12-08, 18:49

1111111111111111111 is a permutable prime

10metreh · 2008-12-08, 18:59

Quote:

Originally Posted by Housemouse

1111111111111111111 is a permutable prime

As are 11111111111111111111111, R317, R1031 etc.

wblipp · 2008-12-10, 23:41

Quote:

Originally Posted by Housemouse

1111111111111111111 is a permutable prime

Nope. At least not by Mally's definition in post #394.

Batalov · 2008-12-11, 00:02

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.

mart_r · 2008-12-11, 16:54

I know. It's strange that they used two different numbers.

Flatlander · 2009-10-23, 14:10

The pair 54 and 56.

Flatlander · 2009-10-27, 12:12

... is the first...

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

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2008-12-07, 15:46	#398
10metreh Nov 2008 2322₁₀ Posts	Do I like Google? A very hard question to answer.

2008-12-07, 17:08	#399
mart_r Dec 2008 you know...around... 3×13×17 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

2008-12-11, 16:54	#405
mart_r Dec 2008 you know...around... 3×13×17 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 2077₁₀ 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...