%N Length of iterations of positive integers which do not appear in a Collatz sequence starting from a smaller positive integer.
%C The sequence of the length of the iteration in the Collatz sequence is known as A006577, and the sequence of positive integers which do not appear in a Collatz sequence starting from a smaller positive integer is listed as A177729. This sequence is basically the combination of the two. Taking the sequence A177729 as input and then listing the length of the iteration for those (from A006577).
%Y Cf. A177729, A006577.
%Y Almost the same as A127933.
%A _Peter Stikker_, Aug 30 2018