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%I #6 Mar 30 2012 18:50:31
%S 1,2,3,4,6,9,15,21
%N Numbers n with no k, 0<k<n, such that mu(n-k)=mu(n)=mu(n+k), where mu=A008683 (Moebius function).
%C A081236(n)=0.
%C Conjecture: there are no more terms.
%C Next term, if one exists, exceeds 10000000000. [From _Sean A. Irvine_, Sep 08 2009]
%K nonn,more
%O 1,2
%A _Reinhard Zumkeller_, Mar 11 2003