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Inverse of A120231.
0

%I #4 Jul 20 2017 22:51:26

%S 1,3,2,6,8,4,5,12,14,7,17,18,9,21,10,11,26,27,13,30,32,15,35,16,38,39,

%T 41,19,44,20,47,48,22,23,53,24,25,57,59,60,62,28,29,66,68,31,71,72,33,

%U 75,34,78,80,36,37,84,86,87,89,40,92,93,42,43,98,99,45,102,46,105,107

%N Inverse of A120231.

%C A permutation of the natural numbers.

%e A120231, written as a function, is

%e {(1,1),(2,3),(3,2),(4,6),(5,7),(6,4),(7,10),(8,5)...}.

%e Reversing each ordered pair and reordering gives

%e {(1,1),(2,3),(3,2),(4,6),(5,8),(6,4),(7,5),(8,12)...}.

%e Suppressing first components leaves

%e 1,3,2,6,8,4,5,12,...

%Y Cf. A073675, A120230, A120231.

%K nonn

%O 1,2

%A _Clark Kimberling_, Jun 11 2006