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Numbers with at least two odd prime factors (not necessarily distinct) such that in binary representation all divisors of n are contained in n.
1

%I #4 Mar 30 2012 18:50:49

%S 55,215,407,1403,1681,3223,3362,3415,6724,13448,13655,15487,25751,

%T 80089,146621,160178,218455,237169,320356,445663,464711,474338,873815,

%U 948676,1662743,1897352,1932377,1975531,2484187,3223001,3410639,3872639

%N Numbers with at least two odd prime factors (not necessarily distinct) such that in binary representation all divisors of n are contained in n.

%C Intersection of A093641 and A105441;

%C A087436(a(n)) > 1.

%Y Cf. A093642, A093641.

%K nonn

%O 1,1

%A _Reinhard Zumkeller_, Apr 09 2005