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Old 2018-04-30, 15:21   #5
JeppeSN
 
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"Jeppe"
Jan 2016
Denmark

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OK, it is a reference to Krywaruczenko, Daniel (2008) "A Reverse Sierpinski Number Problem," Rose-Hulman Undergraduate Mathematics Journal: Vol. 9 : Iss. 2 , Article 4. I will fix the link to that paper in OEIS. /JeppeSN
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