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Search: id:A154355
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| 13, 2, 41, 130, 269, 458, 697, 986, 1325, 1714, 2153, 2642, 3181, 3770, 4409, 5098, 5837, 6626, 7465, 8354, 9293, 10282, 11321, 12410, 13549, 14738, 15977, 17266, 18605, 19994, 21433, 22922, 24461, 26050, 27689, 29378
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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 A=a(n); X=50*a(n)-1 [154358],or,[A154359]; Y=250n-180 [A154360], or, Y=250n-70 [A154361];
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FORMULA
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a(n)=25n^2-36n+13
a(n)=A007533(n-2), n>1. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 14 2009]
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EXAMPLE
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For n=0, a(0)=13; n=2, a(2)=41
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CROSSREFS
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Cf. A154354, A154358, A154359, A154360, A154361
Sequence in context: A008832 A040168 A031066 this_sequence A154354 A078421 A098222
Adjacent sequences: A154352 A154353 A154354 this_sequence A154356 A154357 A154358
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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 07 2009
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