1530 needs 66254 ones [1s] appended to become
the first encountered prime (meaning that any smaller
amount of ones [1s] appended only yield composites).
PRP to base 3,5,7.
PFGW Version 3.7.10.64BIT.20150809.Win_Dev [GWNUM 28.6]
Date of submission : 30 may 2016.
http://www.worldofnumbers.com/em197.htm

To be completed...