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A086945
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a(n) = 7*10^n - 9.
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2
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61, 691, 6991, 69991, 699991, 6999991, 69999991, 699999991, 6999999991, 69999999991, 699999999991, 6999999999991, 69999999999991, 699999999999991, 6999999999999991, 69999999999999991, 699999999999999991, 6999999999999999991, 69999999999999999991
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listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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a(n) = k where R(k+9) = 7.
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LINKS
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MATHEMATICA
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Table[10 FromDigits[PadRight[{6}, n, 9]]+1, {n, 20}] (* Harvey P. Dale, Aug 14 2021 *)
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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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