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A117230
Start with 1 and repeatedly reverse the digits and add 1 to get the next term.
8
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 2, 3, 4, 5, 6, 7, 8, 9, 10, 2, 3, 4, 5, 6, 7, 8, 9, 10, 2, 3, 4, 5, 6, 7, 8, 9, 10, 2, 3, 4, 5, 6, 7, 8, 9, 10, 2, 3, 4, 5, 6, 7, 8, 9, 10, 2, 3, 4, 5, 6, 7, 8, 9, 10, 2, 3, 4, 5, 6, 7, 8, 9, 10, 2, 3, 4, 5, 6, 7, 8, 9, 10, 2, 3, 4, 5, 6, 7, 8, 9, 10, 2, 3, 4, 5, 6, 7, 8, 9, 10
OFFSET
1,2
LINKS
N. J. A. Sloane and others, Sequences of RADD type, OEIS wiki.
FORMULA
Has period 9.
G.f.: -x*(9*x^9 +9*x^8 +8*x^7 +7*x^6 +6*x^5 +5*x^4 +4*x^3 +3*x^2 +2*x +1) / ((x -1)*(x^2 +x +1)*(x^6 +x^3 +1)). - Colin Barker, May 23 2014
MAPLE
read transforms; t1:=[1]; for n from 1 to 80 do t1:=[op(t1), 1+digrev(t1[n])]; od:
MATHEMATICA
Join[{1}, LinearRecurrence[{0, 0, 0, 0, 0, 0, 0, 0, 1}, {2, 3, 4, 5, 6, 7, 8, 9, 10}, 99]] (* Ray Chandler, Jul 18 2015 *)
PROG
(PARI) a(n)=if(n>1, (n-2)%9+2, 1) \\ M. F. Hasler, May 22 2014
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
N. J. A. Sloane, following discussions with Luc Stevens, May 04 2006
EXTENSIONS
Correction to the terms of the sequence (inserted missing term) Jeremy Gardiner, Jun 17 2010
STATUS
approved