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A004084 a(n) = n-th positive integer k such that tan(k-1) <= 0 and tan(k) > 0. 3

%I

%S 1,4,7,10,13,16,19,22,26,29,32,35,38,41,44,48,51,54,57,60,63,66,70,73,

%T 76,79,82,85,88,92,95,98,101,104,107,110,114,117,120,123,126,129,132,

%U 136,139,142,145,148,151,154,158,161,164,167

%N a(n) = n-th positive integer k such that tan(k-1) <= 0 and tan(k) > 0.

%C Gives integer solutions >1 to the equation x=ceiling(r*floor(x/r)) where r=Pi. - _Benoit Cloitre_, Feb 14 2004

%F a(n) = ceiling(Pi*(n-1)) for n>1. - _Benoit Cloitre_, Feb 14 2004

%o (PARI) lista(m) = {for (i=1, m, if ((tan(i-1)<=0) && (tan(i) > 0), print1(i, ", ")););} \\ _Michel Marcus_, Mar 21 2013

%K nonn

%O 1,2

%A _Clark Kimberling_

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Last modified September 20 02:19 EDT 2021. Contains 347577 sequences. (Running on oeis4.)