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%I #18 Feb 03 2019 21:03:05
%S 1,2,3,4,5,5,6,5,5,6,7,7,8,7,6,5,6,7,8,8,9,9,9,8,7,6,5,6,7,8,8,7,8,9,
%T 8,7,8,9,10,10,11,11,10,11,10,10,9,8,8,9,10,9,8,7,8,9,10,10,11,11,10,
%U 9,8,7,8,9,10,11,11,10,10,9,10,10,10,11,11,10,9
%N Number of 1's required to build n using +, -, *, ^ and tetration.
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Tetration">Tetration</a>
%H <a href="/index/Com#complexity">Index to sequences related to the complexity of n</a>
%e a(14) = 7 because 14 = (1+1)^^(1+1+1)-1-1. (Note that 14 is also the smallest index at which this sequence differs from A091334.)
%Y Cf. A091333, A091334, A025280.
%K nonn
%O 1,2
%A _Robin Powell_, Jan 25 2019
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