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 A010721 Period 2: repeat (5,10). 2
 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10, 5, 10 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Index entries for linear recurrences with constant coefficients, signature (0,1) FORMULA a(n)=-5/2*(-1)^n+15/2 =10*(n mod 2)+5*[(n+1) mod 2] - Paolo P. Lava, Oct 27 2006 G.f.: 5(1+2x)/((1-x)(1+x)). a(n)=5*A000034(n). [From R. J. Mathar, Oct 20 2008] PROG (PARI) a(n)=n%2*5+5 \\ Charles R Greathouse IV, Jul 13 2016 CROSSREFS Cf. A176325. Sequence in context: A276652 A137404 A110643 * A046795 A229793 A205854 Adjacent sequences:  A010718 A010719 A010720 * A010722 A010723 A010724 KEYWORD nonn,easy AUTHOR STATUS approved

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