The number 14641 has the same digits as the 4th row of Pascal's triangle.

PFGW Version 1.2.0 for Windows [FFT v23.8]

Primality testing 10^19238+14641 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 7, base 1+sqrt(7)
10^19238+14641 is Fermat and Lucas PRP!

To be completed...