8*(1019-1)/9 - 5*1018 - 5*109 - 5
```Using Pari/gp (< 1s)
gp > isprime(8*(10^19-1)/9-5*10^18-5*10^9-5)
%1 = 1

```

8*(1023-1)/9 - 5*1022 - 5*1011 - 5
```Using Pari/gp (< 1s)
gp > isprime(8*(10^23-1)/9-5*10^22-5*10^11-5)
%1 = 1

```

8*(1031-1)/9 - 5*1030 - 5*1015 - 5
```Using Pari/gp (< 1s)
gp > isprime(8*(10^31-1)/9-5*10^30-5*10^15-5)
%1 = 1

```

8*(10137-1)/9 - 5*10136 - 5*1068 - 5
```Using Pari/gp (time = 188 ms)
gp > isprime(8*(10^137-1)/9-5*10^136-5*10^68-5)
%1 = 1

```

8*(10731-1)/9 - 5*10730 - 5*10365 - 5
```Using Pari/gp (time = 22,125 ms)
gp > default(parisizemax,"1G")
gp > isprime(8*(10^731-1)/9-5*10^730-5*10^365-5)
%1 = 1

```

8*(101159-1)/9 - 5*101158 - 5*10579 - 5
```Using Pari/gp (+/- 2 min 13s)
gp > default(parisizemax,"1G")
gp > isprime(8*(10^1159-1)/9-5*10^1158-5*10^579-5)
%1 = 1
```

8*(101699-1)/9 - 5*101698 - 5*10849 - 5
```Using Pari/gp (+/- 15 min)
gp > default(parisizemax,"1G")
gp > isprime(8*(10^1699-1)/9-5*10^1698-5*10^849-5)
%1 = 1
```

8*(106155-1)/9 - 5*106154 - 5*103077 - 5
```C:\pfgw>pfgw64 -q"8*(10^6155-1)/9-5*10^6154-5*10^3077-5"
PFGW Version 4.0.4.64BIT.20221214.Win_Dev [GWNUM 30.11]

8*(10^6155-1)/9-5*10^6154-5*10^3077-5 is 3-PRP! (0.1724s+0.0003s)

```

8*(1015683-1)/9 - 5*1015682 - 5*107841 - 5
```C:\pfgw>pfgw64 -q"8*(10^15683-1)/9-5*10^15682-5*10^7841-5"
PFGW Version 4.0.4.64BIT.20221214.Win_Dev [GWNUM 30.11]

8*(10^15683-1)/9-5*10^15682-5*10^7841-5 is 3-PRP! (1.2065s+0.0003s)

```

8*(1028415-1)/9 - 5*1028414 - 5*1014207 - 5
```C:\pfgw>pfgw64 -q"8*(10^28415-1)/9-5*10^28414-5*10^14207-5"
PFGW Version 4.0.4.64BIT.20221214.Win_Dev [GWNUM 30.11]

8*(10^28415-1)/9-5*10^28414-5*10^14207-5 is 3-PRP! (4.3560s+0.0004s)

```

8*(1038801-1)/9 - 5*1038800 - 5*1019400 - 5
```C:\pfgw>pfgw64 -q"8*(10^38801-1)/9-5*10^38800-5*10^19400-5"
PFGW Version 4.0.4.64BIT.20221214.Win_Dev [GWNUM 30.11]

8*(10^38801-1)/9-5*10^38800-5*10^19400-5 is 3-PRP! (8.5155s+0.0005s)

```

8*(1046795-1)/9 - 5*1046794 - 5*1023397 - 5
```C:\pfgw>pfgw64 -q"8*(10^46795-1)/9-5*10^46794-5*10^23397-5"
PFGW Version 4.0.4.64BIT.20221214.Win_Dev [GWNUM 30.11]

8*(10^46795-1)/9-5*10^46794-5*10^23397-5 is 3-PRP! (12.3143s+0.0007s)

```

```

```