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Search: id:A154360
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| 70, 320, 570, 820, 1070, 1320, 1570, 1820, 2070, 2320, 2570, 2820, 3070, 3320, 3570, 3820, 4070, 4320, 4570, 4820, 5070, 5320, 5570, 5820, 6070, 6320, 6570, 6820, 7070, 7320, 7570, 7820, 8070, 8320, 8570, 8820, 9070, 9320, 9570, 9820, 10070, 10320
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Pell's equation X^2-AY^2=1, with Y=a(n); A=25n^2-14n+2 [A15437], or A=25n^2-36n+13 [A154355]; X=1250n^2-1800n+649 [A154358], or X=1250n^2-700n+99 [A154359]
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FORMULA
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a(n)=250n-180
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EXAMPLE
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For n=1, a(1)=70; n=2, a(2)=320
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CROSSREFS
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Cf. A154361, A154359, A154358, A154357, A154355
Sequence in context: A165764 A153669 A072596 this_sequence A151556 A157369 A163434
Adjacent sequences: A154357 A154358 A154359 this_sequence A154361 A154362 A154363
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KEYWORD
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nonn
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AUTHOR
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Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 08 2009
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