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 A178042 Consider the weighted Farey tree A177405/A177407; a(n) = row at which the denominator 2n+1 first appears (assumes first row is labeled row 1). 2

%I

%S 1,2,3,3,3,4,4,5,4,4,5,5,5,4,5,5,6,6,6,6,5,5,6,5,6,7,5,5,7,6,7,6,6,6,

%T 6,6,6,6,6,6,5,6,7,8,7,7,7,7,7,6,7,6,7,7,7,7,6,7,8,7,7,7,7,7,7,7,6,7,

%U 6,8,8,7,7,8,8,7,8,7,7,7,6,6,8,7,7,7,8,8,8,7,7,7,8,8,7,8,8,8,7,8,8

%N Consider the weighted Farey tree A177405/A177407; a(n) = row at which the denominator 2n+1 first appears (assumes first row is labeled row 1).

%C Equals A177903 + 1. See that entry for further information.

%K nonn

%O 0,2

%A _N. J. A. Sloane_, Dec 16 2010

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Last modified January 15 19:32 EST 2021. Contains 340189 sequences. (Running on oeis4.)