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A174951 a(n)=Floor((FoF .. n times .. FoF)(n)), where F(x)=Log(Abs(x)); 0

%I

%S 0,-1,-3,0,-2,-1,0,-1,1,-2,0,-2,-1,-4,-1,-1,0,-2,-2,0,-1,-3,-2,0,-1,

%T -1,-1,-2,-1,-2,0,0,-1,-2,-1,0,-1,-1,-3,0,0,-3,-1,-2,-1,-1,-1,-2,-2,1,

%U -1,-3,-1,-1,1,-1,0,-1,-2,0,-2,0,-1,1,-1,-1,-1,-1,-2,-1,-2,-1,-1,0,0,-1,-4

%N a(n)=Floor((FoF .. n times .. FoF)(n)), where F(x)=Log(Abs(x));

%e Log[5]=1.60944..; Log[Log[5]]=0.475885;Log[Log[Log[5]]]=-0.742579; Log[ -Log[Log[Log[5]]]]=-297626;Log[ -Log[ -Log[Log[Log[5]]]]]= -1.21192 ==>a(5)=Floor[ -1.21192]=-2

%t F[x_] := Log[Abs[x]];a[n_]:=Nest[F, n, n]; Table[Floor[a[n]], {n, 115}]

%K sign

%O 1,3

%A Carmen Tasis Montes (ctasis(AT)uniovi.es), Apr 02 2010

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Last modified October 17 00:35 EDT 2021. Contains 348048 sequences. (Running on oeis4.)