a(16) from http://oeis.org/A352736

48330^65536+48330^32768+48330^16384+48330^8192+48330^4096+48330^2048+48330^1024+48330^512+48330^256+48330^128+48330^64+48330^32+48330^16+48330^8+48330^4+48330^2+48330+1

Sieved to 10^9
Fermat PRP in bases 3 and 7. Lucas PRP in base 6+sqrt(7)

To be completed...