Largest PRP of the form 10^x-y , (length x).
PRP to base 3,5,7. Discovered by Anand S. Nair.
PFGW Version 3.5.7.64BIT.20111115.Win_Stable [GWNUM 26.6].
Date of submission : 21 september 2013.
http://www.worldofnumbers.com

To be completed...