20180429, 19:55  #1 
Nov 2016
7×17×19 Posts 
OEIS sequence A088782
This sequence is in fact the reversed Sierpinski problem with k=10, according to the thread http://mersenneforum.org/showthread.php?t=10354&page=8, this sequence can be extended to a(184), and a(185) is > 10^6 due to the Sierpinski base 185 problem, and the related sequence A088783 can be added another term 177, since a prime 10*173^264234 is known.
Also the sequence A119624 (the reversed Sierpinski problem with k=2) can be extended to a(364), and A119591 (the reversed Riesel problem with k=2) can be extended to a(580). 
20180430, 06:43  #2 
"Jeppe"
Jan 2016
Denmark
155_{10} Posts 
You are absolutely right. This is about primes 10*b^t + 1 for fixed b when t runs from 1 through infinity. You call it reversed Sierpiński?
I am extending A088783 as you suggested (see "History" of the entry until edits are approved). /JeppeSN 
20180430, 14:05  #3  
Nov 2016
7·17·19 Posts 
Quote:
You can also extend A088782 to n=184, A119624 to n=364, A253178 to n=242 and A119591 to n=580 (by create a bfile). Last fiddled with by sweety439 on 20180430 at 14:05 

20180430, 14:09  #4 
Nov 2016
7·17·19 Posts 
Besides, you can create afiles for these sequences for the status (with some unknown terms, you can use "?" for them and give the test limits) to n=1000.

20180430, 15:21  #5 
"Jeppe"
Jan 2016
Denmark
5·31 Posts 
OK, it is a reference to Krywaruczenko, Daniel (2008) "A Reverse Sierpinski Number Problem," RoseHulman Undergraduate Mathematics Journal: Vol. 9 : Iss. 2 , Article 4. I will fix the link to that paper in OEIS. /JeppeSN

20180430, 19:16  #6 
Nov 2016
8D5_{16} Posts 

20180430, 19:17  #7  
Nov 2016
100011010101_{2} Posts 
Quote:


20180430, 22:52  #8 
"Jeppe"
Jan 2016
Denmark
9B_{16} Posts 
Sweety439, I think you should update those OEIS entries yourself. /JeppeSN

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