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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 From R. J. Mathar, Oct 20 2008: (Start) a(n) = 5*A000034(n). G.f.: 5(1+2x)/((1-x)(1+x)). (End) MATHEMATICA Table[5 + 5 Mod[n, 2], {n, 0, 50}] (* Jinyuan Wang, Feb 26 2020 *) 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 A337545 A229793 Adjacent sequences:  A010718 A010719 A010720 * A010722 A010723 A010724 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified June 24 21:50 EDT 2021. Contains 345433 sequences. (Running on oeis4.)