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A157287
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a(n) = 1728*n - 24.
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3
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1704, 3432, 5160, 6888, 8616, 10344, 12072, 13800, 15528, 17256, 18984, 20712, 22440, 24168, 25896, 27624, 29352, 31080, 32808, 34536, 36264, 37992, 39720, 41448, 43176, 44904, 46632, 48360, 50088, 51816, 53544, 55272, 57000, 58728
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OFFSET
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1,1
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COMMENTS
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The identity (10368*n^2 - 288*n + 1)^2 - (36*n^2-n)*(1728*n-24)^2 = 1 can be written as A157288(n)^2 - A157286(n)*a(n)^2 = 1 (see also second part of the initial comment in A157286). - Vincenzo Librandi, Jan 28 2012
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LINKS
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FORMULA
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MATHEMATICA
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PROG
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(Magma) I:=[1704, 3432]; [n le 2 select I[n] else 2*Self(n-1)-Self(n-2): n in [1..50]]; // Vincenzo Librandi, Jan 28 2012
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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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EXTENSIONS
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STATUS
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approved
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