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A199685
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a(n) = 5*10^n+1.
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6
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6, 51, 501, 5001, 50001, 500001, 5000001, 50000001, 500000001, 5000000001, 50000000001, 500000000001, 5000000000001, 50000000000001, 500000000000001, 5000000000000001, 50000000000000001, 500000000000000001, 5000000000000000001
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OFFSET
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0,1
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LINKS
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FORMULA
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a(n) = 10*a(n-1)-9.
a(n) = 11*a(n-1)-10*a(n-2).
G.f.: 3*(2-5*x)/((1-x)*(1-10*x)).
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MATHEMATICA
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LinearRecurrence[{11, -10}, {6, 51}, 30] (* Harvey P. Dale, Apr 06 2013 *)
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PROG
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(Magma) [5*10^n+1: n in [0..30]];
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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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