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What is the next number in the sequence 2, 3, 4, 82000, ...? It is a well defined sequence, but it may or may not have a 5th number!

To learn how the sequence is defined, see

For an overview of how this code searches for the next number:

Finally, code details, scaling, and performacnce can be found here:

As of October 20, 2015, I have checked numbers with less than 27.5 million digits and have not found the next number.

TODO list:

  • Specify options such as min base, max base, and starting number on the command line or in an input file
  • Print maximum number checked instead of the number that the master thread has just finished checking