Following smallest PRPs of the form 10^104212+y , (length x+1).
First one is 10^104212+128779.
PRP to base 3,5,7.
PFGW Version 3.7.10.64BIT.20150809.Win_Dev [GWNUM 28.6]
Date of submission : 5 may 2016.
http://www.worldofnumbers.com

To be completed...