Hard Number Series Puzzle

What number comes next in the series?

5 15 5 18 5 24 14 20 _




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----- -----
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Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

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Amazing Facts

No Solution

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