Kepler finds 4 potentially habitable worlds

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in space on (#3F4)
story imageKepler has found 700+ worlds, 100 of which are roughly earth-sized, and 4 of which are both earth-sized and in their sun's Goldilocks Zone, and thus are potentially habitable. The BadAstronomer enthuses eloquently.
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What is the 4th number in the list 6, 40, 6 and twenty eight?