Search: id:A002668
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%I A002668 M1900 N0748
%S A002668 2,8,75,8949,119646723,15849841722437093,708657580163382065836292133774995,
%T A002668 529026553215766321676623343348414600292754204772300344704877695232
%N A002668 Continued cotangent for e.
%D A002668 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A002668 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A002668 D. H. Lehmer, A cotangent analogue of continued fractions, Duke Math. 
               J., 4 (1935), 323-340.
%H A002668 Harry J. Smith, <a href="b002668.txt">Table of n, a(n) for n=1,...,11</
               a>
%H A002668 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               LehmerCotangentExpansion.html">Lehmer Cotangent Expansion</a>
%o A002668 (PARI) { default(realprecision, 10000); bn=vector(11); bn[1]=exp(1); 
               for(n=2, 11, bn[n]=(bn[n-1]*floor(bn[n-1]) + 1)/(bn[n-1] - floor(bn[n-1]))); 
               for (n=1, 11, write("b002668.txt", n, " ", floor(bn[n]))); } [From 
               Harry J. Smith (hjsmithh(AT)sbcglobal.net), May 04 2009]
%Y A002668 Sequence in context: A143760 A064605 A132039 this_sequence A093062 A057984 
               A071254
%Y A002668 Adjacent sequences: A002665 A002666 A002667 this_sequence A002669 A002670 
               A002671
%K A002668 nonn,easy,nice
%O A002668 1,1
%A A002668 N. J. A. Sloane (njas(AT)research.att.com).
%E A002668 More terms from J. O. Shallit.

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