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Find the next number in the series 1, 11, 21, 1121, ??

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Find the next number in the series 1, 11, 21, 1121, ??
posted Sep 1, 2016 by anonymous

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1 Answer

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111221


Everi number is based on previous one with the logic of counting numbers as following:
1 = 1x1 -> 11
11 = 2x1 -> 21
21 = 1x2, 1x1 -> 1211
1211 = 1x1, 1x2, 2x1 ->111221

answer Jul 8, 2018 by Hanifa Mammadov
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