OFFSET
1,1
COMMENTS
a(n) = k where R(k+9) = 7.
R(a(n)) = A086940(n).
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..300
Index entries for linear recurrences with constant coefficients, signature (11,-10).
MATHEMATICA
Table[10 FromDigits[PadRight[{6}, n, 9]]+1, {n, 20}] (* Harvey P. Dale, Aug 14 2021 *)
PROG
(Magma) [7*10^n-9: n in [1..25] ]; // Vincenzo Librandi, Aug 22 2011
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Ray Chandler, Jul 24 2003
STATUS
approved