Which number should fill the blank

Can you fill the blank with the correct number?

6 30 870 756030 _____




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Rectify the following equality 101 - 102 = 1 by moving just one digit.

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In 2007, a puzzle was released and $2 million prizes were offered for the first complete solution. The competition ended at noon on 31 December 2010, with no solution being found. Wiki