A072101 - OEIS

%I #9 Mar 13 2021 10:05:45

%S 0,1,1,7,1,1,1,3,1,1,7,1,15,1,1,5,1,1,6,1,1,12,2,1,52,6,3,2,1,7,1,1,4,

%T 2,1,5,1,1,1,7,2,1,5,1,13,3,1,1,4161,1,1,1,9,4,6,1,12,2,9,3,1,4,3,1,6,

%U 3,2,1,3,4,2,2,3,93,3,1,10,1,2,1,7,4,4,2,1,1,2,2,10,1,1,2,3,3,1,1,3,1

%N Continued fraction expansion of Product_{p prime} (1 - 1/(p^2-1)).

%H Gerhard Niklasch, <a href="http://www.gn-50uma.de/alula/essays/Moree/Moree-details.en.shtml#t15-feller">Some number-theoretical constants: 1000-digit values</a>.

%t (* c= the value at the link above; *) ContinuedFraction[c, 100]

%o (PARI) contfrac(prodeulerrat(1 - 1/(p^2-1))) \\ _Amiram Eldar_, Mar 13 2021

%Y Cf. A065469.

%K cofr,nonn

%O 0,4

%A _Robert G. Wilson v_, Jun 18 2002