Search: id:A050685
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%I A050685
%S A050685 0,0,9,18,189,360,2799,5238,36189,67140,435699,804258,5021289,9238320,
%T A050685 56191599,103144878,615724389,1128303900,6641519499,12154735098,
%U A050685 70773675489,129392615880,746963079399,1364533542918,7822667714589
%N A050685 Number of nonzero palindromes < 10^n and containing at least one digit 
               '0'.
%F A050685 G.f.:(-9*x^2*(x+1))/((x-1)*(3*x-1)*(3*x+1)*(10*x^2-1)) [From Maksym Voznyy 
               (voznyy(AT)mail.ru), Jul 28 2009]
%e A050685 Up to 10^4 we find 18 numbers -> 101, 202, ..., 909, 1001, 2002,... and 
               9009.
%Y A050685 Cf. A050250, A050684.
%Y A050685 Sequence in context: A050250 A080453 A002169 this_sequence A133361 A005400 
               A071587
%Y A050685 Adjacent sequences: A050682 A050683 A050684 this_sequence A050686 A050687 
               A050688
%K A050685 nonn,base
%O A050685 1,3
%A A050685 Patrick De Geest (pdg(AT)worldofnumbers.com), Aug 15 1999.
%E A050685 More terms from Michael Lugo (mlugo(AT)thelabelguy.com), Dec 22 1999
%E A050685 Corrected by T. D. Noe (noe(AT)sspectra.com), Nov 08 2006

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