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A086580 a(n) = k where R(k+9)=9. 8
0, 81, 891, 8991, 89991, 899991, 8999991, 89999991, 899999991, 8999999991, 89999999991, 899999999991, 8999999999991, 89999999999991, 899999999999991, 8999999999999991, 89999999999999991, 899999999999999991 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(n) = 9*9*A002275(n) = 9*A002283(n) R(a(n))=A086573(n) 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.

LINKS

Table of n, a(n) for n=0..17.

FORMULA

a(n) = 9*(10^n-1)

From Chai Wah Wu, Jul 08 2016: (Start)

a(n) = 11*a(n-1) - 10*a(n-2) for n > 1.

G.f.: 81*x/((1 - x)*(1 - 10*x)). (End)

CROSSREFS

Sequence in context: A222995 A173810 A205047 * A206269 A236885 A205729

Adjacent sequences:  A086577 A086578 A086579 * A086581 A086582 A086583

KEYWORD

nonn

AUTHOR

Ray Chandler, Jul 22 2003

STATUS

approved

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Last modified April 20 08:32 EDT 2019. Contains 322306 sequences. (Running on oeis4.)