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 A117230 Start with 1 and repeatedly reverse the digits and add 1 to get the next term. 7
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS N. J. A. Sloane and others, Sequences of RADD type, OEIS wiki. Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 0, 0, 0, 0, 1). FORMULA Has period 9. a(n)=2+[(n-2) mod 9]-9*(C[2*(n-1),n-1] mod 2), with n>=1. - Paolo P. Lava, Oct 21 2008 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 Cf. A117830, A117521, A117828, A117800, A117816, A117817. Sequence in context: A227362 A297236 A103693 * A093882 A138953 A307629 Adjacent sequences:  A117227 A117228 A117229 * A117231 A117232 A117233 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

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Last modified January 18 16:27 EST 2020. Contains 331011 sequences. (Running on oeis4.)