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A086579
a(n) = 8*(10^n - 1).
8
0, 72, 792, 7992, 79992, 799992, 7999992, 79999992, 799999992, 7999999992, 79999999992, 799999999992, 7999999999992, 79999999999992, 799999999999992, 7999999999999992, 79999999999999992, 799999999999999992, 7999999999999999992, 79999999999999999992, 799999999999999999992
OFFSET
0,2
COMMENTS
Original definition: a(n) = k where R(k+8) = 8.
FORMULA
a(n) = 8*9*A002275(n) = 8*A002283(n).
R(a(n)) = A086574(n).
From Chai Wah Wu, Jul 08 2016: (Start)
a(n) = 11*a(n-1) - 10*a(n-2) for n > 1.
G.f.: 72*x/((1 - x)*(1 - 10*x)). (End)
E.g.f.: 8*exp(x)*(exp(9*x) - 1). - Elmo R. Oliveira, Sep 12 2024
CROSSREFS
Cf. A002275, A004086 (R(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.
Sequence in context: A282213 A304828 A268780 * A113855 A082949 A330829
KEYWORD
nonn,easy
AUTHOR
Ray Chandler, Jul 22 2003
EXTENSIONS
Edited by Jinyuan Wang, Aug 04 2021
STATUS
approved