The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A209601 Continued fraction expansion of the sum of the reciprocals of the Mersenne primes (A000668). 3

%I

%S 1,1,14,1,2,3,1,3,2,5,194,1,14,1,2,2,2,40,1,1,1,4,4,1,5,1,4,4,1,3,18,

%T 1,1,7,28,2,5,1,4,13,3,2,2,3,9,2,3,6,1,3,3,3,3,1,1,3,8,1,184,3,2,1,1,

%U 1,3,1,1,12,1,10,2,3,2,6,18,1,1,9

%N Continued fraction expansion of the sum of the reciprocals of the Mersenne primes (A000668).

%H Charles R Greathouse IV, <a href="/A209601/b209601.txt">Table of n, a(n) for n = 1..10000</a>

%o (PARI) isM(p)=my(m=Mod(4,2^p-1));for(i=1,p-2,m=m^2-2);!m

%o s=1/3;forprime(p=3,default(realprecision)*log(10)\log(2), if(isM(p), s+=1./(2^p-1)));v=contfrac(s);vector(#v-2,i,v[i+1]) \\ _Charles R Greathouse IV_, Mar 22 2012

%Y Cf. A000668, A173898, A209600.

%K nonn,cofr

%O 1,3

%A _N. J. A. Sloane_, Mar 10 2012

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 24 13:24 EST 2020. Contains 331193 sequences. (Running on oeis4.)