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pseudoprime A backgammon prime (six consecutive occupied 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. [{Jargon File}] pseudoprime: n. A backgammon prime (six consecutive occupied points) with one point
missing. This term is an esoteric pun derived from number theory: a number that passes a certain kind of “primality test” may be called a pseudoprime (all primes pass any such test, but so do some composite numbers), and any number that passes several is, in some sense, almost certainly prime. The hacker backgammon usage stems from the idea that a pseudoprime is almost as good as a prime: it will do the same job unless you are unlucky.
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