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 A002667 Continued cotangent for Pi. (Formerly M3171 N1286) 19
 3, 73, 8599, 400091364, 371853741549033970, 253461181173408820488703379557217678 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 REFERENCES D. H. Lehmer, A cotangent analogue of continued fractions, Duke Math. J., 4 (1935), 323-340. N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS Harry J. Smith, Table of n, a(n) for n = 0..9 D. H. Lehmer, A cotangent analogue of continued fractions, Duke Math. J., 4 (1935), 323-340. [Annotated scanned copy] PROG (PARI) { default(realprecision, 10000); bn=vector(10); bn[1]=Pi; for(n=2, 10, bn[n]=(bn[n-1]*floor(bn[n-1]) + 1)/(bn[n-1] - floor(bn[n-1]))); for (n=1, 10, write("b002667.txt", n-1, " ", floor(bn[n]))); } \\ Harry J. Smith, May 04 2009 CROSSREFS Sequence in context: A012810 A020517 A119017 * A145675 A121981 A215961 Adjacent sequences:  A002664 A002665 A002666 * A002668 A002669 A002670 KEYWORD nonn AUTHOR EXTENSIONS More terms from Jeffrey Shallit STATUS approved

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Last modified November 13 19:25 EST 2018. Contains 317149 sequences. (Running on oeis4.)