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A154358
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1250n^2 - 1800n + 649.
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4
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649, 99, 2049, 6499, 13449, 22899, 34849, 49299, 66249, 85699, 107649, 132099, 159049, 188499, 220449, 254899, 291849, 331299, 373249, 417699, 464649, 514099, 566049, 620499, 677449, 736899, 798849, 863299, 930249
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| The identity (1250n^2-1800n+649)^2-(25n^2-36n+13)*(250n-180)^2=1 can be written as a(n)^2-A154355(n)*A154360(n)^2=1. See also the third comment in A154357.
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (3,-3,1).
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FORMULA
| G.f.: -(649-1848*x+3699*x^2)/(x-1)^3. - R. J. Mathar, Jan 05 2011
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CROSSREFS
| Cf. A154359, A154360, A154361, A154355, A154357.
Sequence in context: A035755 A107551 A202056 * A185666 A114047 A157915
Adjacent sequences: A154355 A154356 A154357 * A154359 A154360 A154361
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KEYWORD
| nonn,easy
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AUTHOR
| Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 08 2009
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EXTENSIONS
| Offset and one entry corrected by R. J. Mathar, Jan 05 2011
Librandi's comment rewritten by Bruno Berselli, Dec 13 2011
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