20100418, 01:21  #1 
Apr 2010
3^{3} Posts 
What minimum exponent would give 100M digit prime?
Hello All,
What minimum exponent value would give a 100M digit prime? Also is there a calculator on the internet or that I could download that could give me the specific number that any exponent I use in the formula 2^P  1? Like to calculate the value of: 2^49254458  1? Of course my computer's calculator gives infinity!!!!! Thanks. Last fiddled with by odin on 20100418 at 01:22 
20100418, 01:24  #2 
Jul 2005
Des Moines, Iowa, USA
2×5×17 Posts 
http://mersennearies.sili.net/digits.php calculate number of digits from an exponent
i think it something above 332,000,000 for the exponent to give a 100M digit mersenne number. 
20100418, 01:28  #3  
Apr 2010
3^{3} Posts 
Quote:


20100418, 02:22  #4  
Jul 2006
Calgary
5^{2}×17 Posts 
Quote:


20100418, 05:58  #5 
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
11×853 Posts 
332192831 is the first prime that is 100 M digits.
There is a thread for those that TF'ing those in the range. 
20100418, 11:05  #6 
Nov 2008
2322_{10} Posts 

20100418, 11:09  #7 
Jul 2006
Calgary
5^{2}×17 Posts 

20100418, 13:57  #8 
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
11×853 Posts 

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