A040700 - OEIS

%I #19 Jan 10 2024 00:30:32

%S 26,1,25,1,52,1,25,1,52,1,25,1,52,1,25,1,52,1,25,1,52,1,25,1,52,1,25,

%T 1,52,1,25,1,52,1,25,1,52,1,25,1,52,1,25,1,52,1,25,1,52,1,25,1,52,1,

%U 25,1,52,1,25,1,52,1,25,1,52,1,25,1,52,1,25,1,52,1,25

%N Continued fraction for sqrt(727).

%H <a href="/index/Con#confC">Index entries for continued fractions for constants</a>.

%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,0,1).

%F From _Amiram Eldar_, Jan 10 2024: (Start)

%F Multiplicative with a(2) = 25, a(2^e) = 52 for e >= 2, and a(p^e) = 1 for an odd prime p.

%F Dirichlet g.f.: zeta(s) * (1 + 3/2^(s-3) + 27/2^(2*s)). (End)

%p with(numtheory): Digits := 300: convert(evalf(sqrt(727)),confrac);

%t ContinuedFraction[Sqrt[727], 100] (* _Amiram Eldar_, Jan 10 2024 *)

%K nonn,cofr,easy,mult

%O 0,1

%A _N. J. A. Sloane_