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What will be next series in - 15, 31, 63, 80, 242, ??

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What will be next series in - 15, 31, 63, 80, 242, ??
posted Jun 25, 2015 by anonymous

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1 Answer

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728


15, 31, 63, 80, 242, 728
15=2^4-1
31=2^5-1
63=2^6-1
80=3^4-1
242=3^5-1
728=3^6-1

answer Aug 1 by Hanifa Mammadov
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