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Old 2021-05-15, 04:49   #260
gd_barnes
 
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May 2007
Kansas; USA

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Reviving an old effort:

Here is an updated web page for all k*2^n-+1 twins for k<100K and n<=50K:
http://www.noprimeleftbehind.net/gary/twins100K.htm

Here is an updated web page for all k*2^n-+1 twins for k=100K-1M and n<=50K if the k has a twin for n>10K:
http://www.noprimeleftbehind.net/gary/twins1M.htm

Many years ago I had completed this effort to n=48K. I recently completed n=48K-50K. Here are the twins found in that range:
694599*2^48501-+1
852861*2^49195-+1
197109*2^49733-+1

I saw in this thread that at least 2 of those twins had already been found but this effort fully completes that search range.

k<1M is now fully complete to n=50K. The search depth of many other k's was updated to reflect mostly current efforts of various projects. No other twins were found. Mainly these included k<2000.

I have fully sieved files up to n=60K. My plan is to work on it on and off over the next few months.

Gary

Last fiddled with by gd_barnes on 2021-05-15 at 05:04
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