Search: id:A102807
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%I A102807
%S A102807 1,16,1156,111556,11115556,1111155556,111111555556,11111115555556,1111111155555556,
%T A102807 111111111555555556,11111111115555555556,1111111111155555555556,111111111111555555555556,
%U A102807 11111111111115555555555556,1111111111111155555555555556,111111111111111555555555555556
%N A102807 The number (333...334)^2.
%C A102807 An infinite sequence of squares with no zeros in base 10.
%D A102807 Italo Ghersi, Matematica dilettevole e curiosa, pag. 111-112, Hoepli, 
               Milano, 1967 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), 
               Dec 31 2008]
%F A102807 a(n)= (100^n+4*10^n+4)/9. G.f.: (1-95x+490x^2)/((1-x)(100x-1)(10x-1)). 
               [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 06 2009]
%Y A102807 Cf. A052041, A102794.
%Y A102807 Sequence in context: A029701 A144915 A053903 this_sequence A160131 A064346 
               A113104
%Y A102807 Adjacent sequences: A102804 A102805 A102806 this_sequence A102808 A102809 
               A102810
%K A102807 nonn
%O A102807 0,2
%A A102807 Ron Knott, Feb 27 2005

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