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A156846
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a(n) = 12167n - 3588.
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4
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8579, 20746, 32913, 45080, 57247, 69414, 81581, 93748, 105915, 118082, 130249, 142416, 154583, 166750, 178917, 191084, 203251, 215418, 227585, 239752, 251919, 264086, 276253, 288420, 300587, 312754, 324921, 337088, 349255, 361422, 373589
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OFFSET
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1,1
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COMMENTS
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The identity (279841*n^2-165048*n+24335)^2-(529*n^2-312*n+46)*(12167*n-3588)^2=1 can be written as A156843(n)^2-A156841(n)*a(n)^2=1.
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LINKS
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FORMULA
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a(n) = 2*a(n-1) -a(n-2).
G.f.: x*(8579+3588*x)/(x-1)^2.
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MATHEMATICA
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LinearRecurrence[{2, -1}, {8579, 20746}, 40]
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PROG
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(Magma) I:=[8579, 20746]; [n le 2 select I[n] else 2*Self(n-1)-Self(n-2): n in [1..50]];
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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