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A010691
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Period 2: repeat (1,10)
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2
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1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Regular continued fraction of (5+sqrt 35)/10. - R. J. Mathar, Nov 21 2011
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..1000
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FORMULA
| a(n)=-9/2*(-1)^n+11/2 a(n)=10*(n mod 2)+(n+1) mod 2 - Paolo P. Lava, Oct 20 2006
G.f.: (1+10*z)/(1-z^2). [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Feb 25 2009]
a(n) = 10^n mod 11. - M. F. Hasler, Mar 10, 2011
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MAPLE
| g:=(1+10*z)/((1-z^2)): gser:=series(g, z=0, 66): seq((coeff(gser, z, n)), n=0..65); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Feb 25 2009]
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PROG
| (MAGMA) [10^n mod 11: n in [0..80]]; // Vincenzo Librandi, Aug 24 2011
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CROSSREFS
| Cf. A036117, A070341, A168429, A070367, A070392, A070404, A048271, A187466.
Sequence in context: A144261 A046148 A164915 * A143970 A093645 A182620
Adjacent sequences: A010688 A010689 A010690 * A010692 A010693 A010694
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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