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 A242647 Sign of (the n-th continued fraction convergent to 2*Pi divided by the n-th convergent to Pi minus 2). 2
 0, 1, -1, 1, -1, 1, -1, 0, 1, 0, 0, 0, 0, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 0, 0, 1, 0, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 0, 0, 0, -1, 1, -1, 1, -1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1 COMMENTS Zeros appear in clusters (see A242857). Conjecture: Remove all zeros and the remaining terms will alternate signs. REFERENCES Hans Havermann, Posting to Math Fun Mailing List, May 22 2014. LINKS Hans Havermann, Table of n, a(n) for n = 1..10000 MATHEMATICA Sign[Convergents[2*Pi, 200]/Convergents[Pi, 200]-2] CROSSREFS Cf. A242857; Convergents to 2*Pi: A046955 (assuming offset 0)/A242859; Convergents to Pi: A002485/A002486 (both assuming offset -1). Sequence in context: A182067 A196147 A097325 * A167393 A275606 A106549 Adjacent sequences:  A242644 A242645 A242646 * A242648 A242649 A242650 KEYWORD sign AUTHOR N. J. A. Sloane, May 23 2014 STATUS approved

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Last modified October 27 19:59 EDT 2020. Contains 338036 sequences. (Running on oeis4.)