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226, 451, 676, 901, 1126, 1351, 1576, 1801, 2026, 2251, 2476, 2701, 2926, 3151, 3376, 3601, 3826, 4051, 4276, 4501, 4726, 4951, 5176, 5401, 5626, 5851, 6076, 6301, 6526, 6751, 6976, 7201, 7426, 7651, 7876, 8101, 8326, 8551, 8776, 9001, 9226, 9451, 9676
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OFFSET
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1,1
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COMMENTS
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The identity (225*n+1)^2-(225*n^2+2*n)*(15)^2=1 can be written as a(n)^2-A158228(n)*(15)^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*(226-x)/(1-x)^2.
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MATHEMATICA
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LinearRecurrence[{2, -1}, {226, 451}, 50]
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PROG
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(Magma) I:=[226, 451]; [n le 2 select I[n] else 2*Self(n-1)-Self(n-2): n in [1..50]];
(PARI) a(n) = 225*n + 1.
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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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