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A051509 a(n) = round(Sum_{k=0..n} tan(k)). 0

%I #10 Mar 28 2015 22:34:35

%S 0,2,-1,-1,0,-3,-3,-2,-9,-10,-9,-235,-236,-235,-228,-229,-228,-225,

%T -226,-226,-224,-225,-225,-224,-226,-226,-225,-228,-228,-227,-234,

%U -234,-234,-309,-310,-309,-301,-302,-302,-298,-299,-299,-297,-298,-298,-297,-299,-299,-298,-301,-301,-300,-306

%N a(n) = round(Sum_{k=0..n} tan(k)).

%t Floor[#+1/2]&/@Accumulate[Tan[Range[0,60]]] (* _Harvey P. Dale_, Jun 02 2012 *)

%K sign

%O 0,2

%A _N. J. A. Sloane_

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)