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%I #5 Oct 20 2016 16:10:33
%S 0,1,4,2,1750,8771,3,5,16,14,12,10,8,6,8765,25,1746,1744,23,26353,7,9,
%T 11,13,15,17,52,50,48,46,44,42,40,38,36,34,32,30,28,26,24,22,20,18,
%U 8745,77,1732,5246,75,15800,8741,73,26331,8739,71,1728,5242,69,15796
%N Left inverse of A277558
%C If A277558 is a permutation, this is the full inverse of it.
%C After 10^11 terms of A277558, the smallest number which has not appeared is 609790506. The largest number in the first 600 million terms of this sequence is a(597249348) = 97840303230.
%H Benjamin Chaffin, <a href="/A277578/b277578.txt">Table of n, a(n) for n = 0..10000</a>
%e A277558(16) = 8, so a(8) = 16.
%Y Cf. A277558, A005132
%K nonn
%O 0,3
%A _Benjamin Chaffin_, Oct 20 2016
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