This number is a prime.

                                                           869033 3381690951

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Marxen and Buntrock proved in 1997 that the maximal number of steps that a six-state Turing machine can make on an initially blank tape before eventually halting is at least 8690333381690951.

Submitted: 2006-08-23 23:03:27;   Last Modified: 2008-05-23 15:03:44.
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