4*(1091-1)/9 - 3*1090 - 3*1045 - 3
Using Pari/gp (< 1s)
     gp > isprime(4*(10^91-1)/9-3*10^90-3*10^45-3)
     %1 = 1


4*(10131-1)/9 - 3*10130 - 3*1065 - 3
Using Pari/gp (< 1s)
     gp > isprime(4*(10^131-1)/9-3*10^130-3*10^65-3)
     %1 = 1


4*(1018301-1)/9 - 3*1018300 - 3*109150 - 3
C:\pfgw>pfgw64 -q"4*(10^18301-1)/9-3*10^18300-3*10^9150-3"
PFGW Version 4.0.4.64BIT.20221214.Win_Dev [GWNUM 30.11]

4*(10^18301-1)/9-3*10^18300-3*10^9150-3 is 3-PRP! (1.6497s+0.0010s)


4*(1045655-1)/9 - 3*1045654 - 3*1022827 - 3
C:\pfgw>pfgw64 -q"4*(10^45655-1)/9-3*10^45654-3*10^22827-3"
PFGW Version 4.0.4.64BIT.20221214.Win_Dev [GWNUM 30.11]

4*(10^45655-1)/9-3*10^45654-3*10^22827-3 is 3-PRP! (11.7357s+0.0006s)
 

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