$ cd /home/user/DigitsOfPi/DigitsOfPi
$ mdb bin/Debug/DigitsOfPi.exe
Mono Debugger
(mdb) start
Starting program: bin/Debug/DigitsOfPi.exe 

Thread @1 stopped at #0: 0xb78e023f in DigitsOfPi.MainClass.
Main(string[])+0x7 at /home/user/DigitsOfPi/DigitsOfPi/Main.cs:10.
  10  Application.Init ();
(mdb) b Plouffe_Bellard.cs:131
Breakpoint 4 at Plouffe_Bellard.CalculatePiDigits(int):131
(mdb) c
...
Thread @1 hit breakpoint 4 at #0: 0xb63fce24 in Plouffe_Bellard.
CalculatePiDigits(int)+0x84 at 
/home/user/DigitsOfPi/DigitsOfPi/Plouffe_Bellard.cs:131.
 131  for (int a = 3; a <= (2 * N); a = next_prime(a)) 
(mdb) p N 
(int) 69
(mdb) s
Thread @1 stopped at #0: 0xb63fd045 in Plouffe_Bellard.
CalculatePiDigits(int)+0x2a5 at 
/home/user/DigitsOfPi/DigitsOfPi/Plouffe_Bellard.cs:131.
 131  for (int a = 3; a <= (2 * N); a = next_prime(a)) 
