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-   -   10^N+1 (https://www.mersenneforum.org/showthread.php?t=10324)

Housemouse 2008-05-23 13:36

10^N+1
 
For all N>2, is 10^N+1 always composite?

wpolly 2008-05-23 13:39

[URL]http://www1.uni-hamburg.de/RRZ/W.Keller/GFN10.html[/URL]

henryzz 2008-05-23 15:27

[URL]http://www.mersenneforum.org/showthread.php?t=8848[/URL]

geoff 2008-05-28 00:20

10^2^23+1 = 10^8388608+1 is the smallest candidate that hasn't yet been shown to be composite. It would take about 89 days to do a PRP test on this number using a 2.66GHz Core 2. Some more trial factoring would probably be worthwhile before starting the PRP test.


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