A _PDP_ or _Plateau and Depression Prime_ : 7222...2227
Ref.: file _deplat.htm_ at _www.worldofnumbers.com_.
PRP to base 3,5,7.
PFGW Version 20041020.Win_Stable (v1.2 RC1c) [FFT v23.8].
Date of submission : 22 apr 2005.

To be completed...