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A023112
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Squares that remain square when the digit 4 is appended.
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2
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0, 144, 207936, 299843856, 432374632704, 623483920515600, 899063381008862784, 1296448771930859619216, 1869478230060918562046976, 2695786311299072635612120464, 3887321991415032679634115662400
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OFFSET
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1,2
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COMMENTS
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The terms of the sequence are the squares of the y-values in the solution to the Pellian equation x^2-10*y^2=4. - Colin Barker, Sep 28 2013
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LINKS
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FORMULA
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Empirical g.f.: -144*x^2*(x+1) / ((x-1)*(x^2-1442*x+1)). - Colin Barker, Jan 31 2013
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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