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A158127
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a(n) = 100*n^2 + 2*n.
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2
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102, 404, 906, 1608, 2510, 3612, 4914, 6416, 8118, 10020, 12122, 14424, 16926, 19628, 22530, 25632, 28934, 32436, 36138, 40040, 44142, 48444, 52946, 57648, 62550, 67652, 72954, 78456, 84158, 90060, 96162, 102464, 108966, 115668, 122570
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OFFSET
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1,1
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COMMENTS
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The identity (100*n + 1)^2 - (100*n^2 + 2*n)*10^2 = 1 can be written as A158128(n)^2 - a(n)*10^2 = 1. - Vincenzo Librandi, Feb 11 2012
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LINKS
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FORMULA
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MATHEMATICA
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LinearRecurrence[{3, -3, 1}, {102, 404, 906}, 50] (* Vincenzo Librandi, Feb 11 2012 *)
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PROG
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(Magma) I:=[102, 404, 906]; [n le 3 select I[n] else 3*Self(n-1)-3*Self(n-2)+1*Self(n-3): n in [1..50]]; // Vincenzo Librandi, Feb 11 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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STATUS
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approved
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