OFFSET
0,2
COMMENTS
Final digits of odd numbers in decimal representation: a(n) = A010879(A005408(n)). - Reinhard Zumkeller, Apr 11 2010
LINKS
Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,1).
FORMULA
a(n) = 2*(n mod 5) + 1, see PARI code. - Bruno Berselli, Jul 25 2018
G.f.: -((9*x^4 + 7*x^3 + 5*x^2 + 3*x + 1)/(x^5 - 1)). - Kritsada Moomuang, Sep 06 2018
a(n) = a(n - 5) for n > 4. - Stefano Spezia, Sep 07 2018
MATHEMATICA
PadRight[{}, 120, {1, 3, 5, 7, 9}] (* Harvey P. Dale, May 06 2014 *)
LinearRecurrence[{0, 0, 0, 0, 1}, {1, 3, 5, 7, 9}, 50] (* or *)
CoefficientList[Series[-((9*x^4 + 7*x^3 + 5*x^2 + 3*x + 1)/(x^5 - 1)), {x, 0, 50}], x] (* Stefano Spezia, Sep 07 2018 *)
PROG
(PARI) a(n)=1+2*(n%5) \\ Jaume Oliver Lafont, Aug 28 2009
(Magma) &cat [[1, 3, 5, 7, 9]^^25]; // Vincenzo Librandi, Jul 25 2018
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Paul Curtz, Aug 11 2008
STATUS
approved