Quote:
Originally Posted by Cybertronic
Here are maybe more Primo jobs ?!
Even I found the smallest 20000 digit twin PRPs.
10^19999+1514722609+d,d=0,2
Smallest 20000digit PRP is 10^19999+110949 / found by Patrick De Geest
best,
Norman

These are not "top20" special forms at the PrimePages. They would take you 16 times as long each as the 10k digit primes you certified.