Leyland prime. Tested using PFGW:

Generic modular reduction using generic reduction AVX-512 FFT length
480K, Pass1=960, Pass2=512, clm=1, 8 threads on A 4762953-bit number

Detected in MAXERR>0.45 (round off check) in prp_using_gwnum
Iteration: 1684576/4762952 ERROR: ROUND OFF 0.45687>0.45

PFGW will automatically rerun the test with -a1

Generic modular reduction using generic reduction AVX-512 FFT length 504K, Pass1=1344, Pass2=384, clm=1, 8 threads on A 4762953-bit number

300102^59935+59935^300102 is 3-PRP! (41571.6765s+0.0174s)

To be completed...