%N Position where n (presumably) appears the last time in A107261, or 0 if n keeps appearing.
%C The sequence resulted from analysis of A107261(n), n<=3e5.
%C Numbers that seem to keep appearing include 6,14,15,19,23,35,38,39...
%Y Cf. A107263.
%A _Ralf Stephan_, May 15 2005