Which digit completes the final number in the series: #24, 81, 63, 26, 41, 28, 25, 65, 1__#?

1 Answer
George C.
Jun 3, 2016

#2#

Explanation:

Does the sequence #2, 4, 8, 16, 32, 64, 128, 256, 512# ring any bells?

The given sequence is constructed of consecutive pairs of digits from this geometric sequence.

This is listed in the Online Encyclopedia of Integer Sequences as A030622.

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