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A086575
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a(n) = 4*(10^n - 1).
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8
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0, 36, 396, 3996, 39996, 399996, 3999996, 39999996, 399999996, 3999999996, 39999999996, 399999999996, 3999999999996, 39999999999996, 399999999999996, 3999999999999996, 39999999999999996, 399999999999999996, 3999999999999999996, 39999999999999999996, 399999999999999999996
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OFFSET
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0,2
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COMMENTS
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Original definition: a(n) = k where R(k+4) = 4.
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LINKS
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FORMULA
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a(n) = 11*a(n-1) - 10*a(n-2) for n > 1.
G.f.: 36*x/((1 - x)*(1 - 10*x)). (End)
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MATHEMATICA
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LinearRecurrence[{11, -10}, {0, 36}, 20] (* Harvey P. Dale, May 14 2017 *)
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CROSSREFS
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One of family of sequences of form a(n) = k, where R(k+m) = m, m=1 to 9; m=1: A002283, m=2: A086573, m=3: A086574, m=4: A086575, m=5: A086576, m=6: A086577, m=7: A086578, m=8: A086579, m=9: A086580.
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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