Search: id:A050684
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%I A050684
%S A050684 1,2,20,38,290,542,3710,6878,44390,81902,509510,937118,5685590,
%T A050684 10434062,62170310,113906558,669532790,1225159022,7125795110,
%U A050684 13026431198,75132155990,137237880782,786189403910,1435140927038
%N A050684 Number of nonzero palindromes < 10^n and containing at least one digit 
               '1'.
%F A050684 a(2n) = 2*(10^n - 9^n); a(2n + 1) = 2*(10^n - 9^n) + 9*10^n - 8*9^n. 
               - David Wasserman (wasserma(AT)spawar.navy.mil), Feb 14 2002
%e A050684 Up to 10^2 we find two numbers 1 and 11.
%Y A050684 Cf. A050250, A050685.
%Y A050684 Sequence in context: A112271 A103076 A062133 this_sequence A073214 A097652 
               A059211
%Y A050684 Adjacent sequences: A050681 A050682 A050683 this_sequence A050685 A050686 
               A050687
%K A050684 nonn,base
%O A050684 1,2
%A A050684 Patrick De Geest (pdg(AT)worldofnumbers.com), Aug 15 1999.
%E A050684 More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Feb 14 
               2002

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