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4, 31, 301, 3001, 30001, 300001, 3000001, 30000001, 300000001, 3000000001, 30000000001, 300000000001, 3000000000001, 30000000000001, 300000000000001, 3000000000000001, 30000000000000001, 300000000000000001, 3000000000000000001
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refs;
listen;
history;
text;
internal format)
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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.: (4-13*x)/((1-x)*(1-10*x)).
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MATHEMATICA
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3*10^Range[0, 20]+1 (* or *) LinearRecurrence[{11, -10}, {4, 31}, 20] (* Harvey P. Dale, Dec 12 2016 *)
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PROG
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(Magma) [3*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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