1,2

Table of n, a(n) for n=1..81.

A040002 (cfrac for n=1) has period length 1, so a(1)=1. A040015 (cfrac for n=2) has period length 2, so a(2)=2. A010135 (cfrac for n=3) has period length 6, so a(3)=6. - R. J. Mathar, Feb 10 2016

Table[Length[ContinuedFraction[Sqrt[5]n][[2]]], {n, 90}] (* Harvey P. Dale, Apr 13 2015 *)

Sequence in context: A220532 A060295 A102912 * A151853 A268766 A214775

Adjacent sequences: A064847 A064848 A064849 * A064851 A064852 A064853

nonn

R. K. Guy, Oct 26 2001

approved