Search: id:A154277
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%I A154277
%S A154277 17,26,197,530,1025,1682,2501,3482,4625,5930,7397,9026,10817,12770,
%T A154277 14885,17162,19601,22202,24965,27890,30977,34226,37637,41210,44945,
%U A154277 48842,52901,57122,61505,66050,70757,75626,80657,85850,91205,96722
%N A154277 a(n)=81n^2-72n+17
%C A154277 Pell's equation X^2-A^2=1, with X=a(n); A=9n^2-10n+3 [A154262], or, A=9n^2-8n+2 
               [A154254]; Y= 27n+12 [A154266], or, Y=27n+15 [A154267]
%F A154277 a(n)=81n^2-72n+17
%e A154277 For n=0, a(0)=17; n=2, a(2)=197
%Y A154277 Cf. A154276, A154262, A154254, A154266, A154267
%Y A154277 Sequence in context: A120143 A031204 A085051 this_sequence A140150 A166658 
               A033702
%Y A154277 Adjacent sequences: A154274 A154275 A154276 this_sequence A154278 A154279 
               A154280
%K A154277 nonn
%O A154277 1,1
%A A154277 Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 06 2009
%E A154277 92205 replaced by 91205 - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Jan 07 2009

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