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A085708
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Arithmetic derivative of 10^n.
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4
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0, 7, 140, 2100, 28000, 350000, 4200000, 49000000, 560000000, 6300000000, 70000000000, 770000000000, 8400000000000, 91000000000000, 980000000000000, 10500000000000000, 112000000000000000, 1190000000000000000, 12600000000000000000, 133000000000000000000
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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a(n) = 7*n*10^(n-1).
G.f.: 7*x/(10*x-1)^2.
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MATHEMATICA
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PROG
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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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