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pseudoprime

   points) with one point missing.  This term is an esoteric pun
   derived from a mathematical method that, rather than determining
   precisely whether a number is prime (has no divisors), uses a
   statistical technique to decide whether the number is `probably'
   prime.  A number that passes this test is called a pseudoprime.
   The hacker backgammon usage stems from the idea that a pseudoprime
   is almost as good as a prime: it does the job of a prime until
   proven otherwise, and that probably won't happen.