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 A123724 Partial sums of (-1)^floor(n*2^(1/3)). 4
 -1, 0, -1, -2, -1, -2, -1, 0, -1, 0, -1, -2, -1, -2, -1, 0, -1, 0, -1, -2, -1, -2, -1, 0, -1, 0, 1, 0, 1, 0, -1, 0, -1, 0, 1, 0, 1, 0, -1, 0, -1, 0, 1, 0, 1, 0, -1, 0, -1, 0, 1, 0, 1, 2, 1, 2, 1, 0, 1, 0, 1, 2, 1, 2, 1, 0, 1, 0, 1, 2, 1, 2, 1, 0, 1, 0, -1, 0, -1, 0, 1, 0, 1, 0, -1, 0, -1, 0, 1, 0, 1, 0, -1, 0, -1, 0, 1, 0, 1, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Remarkably, these partial sums appear to have several periods of length 153008. This sum is not discussed by O'Bryant et al. LINKS T. D. Noe, Table of n, a(n) for n=1..40000 T. D. Noe, Plot of 10^6 terms Kevin O'Bryant, Bruce Reznick and Monika Serbinowska, Almost alternating sums, arXiv:math/0308087 [math.NT], 2003-2005. Kevin O'Bryant, Bruce Reznick and Monika Serbinowska, Almost alternating sums, Amer. Math. Monthly, Vol. 113 (October 2006), 673-688. MATHEMATICA Rest[FoldList[Plus, 0, (-1)^Floor[2^(1/3)*Range[120]]]] Accumulate[(-1)^Floor[Range[100]Surd[2, 3]]] (* Harvey P. Dale, Apr 16 2015 *) CROSSREFS Cf. A123737 (sum for sqrt(2)), A123738 (sum for Pi), A123739 (sum for e). Sequence in context: A165582 A165472 A228109 * A107016 A226519 A066057 Adjacent sequences:  A123721 A123722 A123723 * A123725 A123726 A123727 KEYWORD easy,nice,sign,look AUTHOR T. D. Noe, Oct 11 2006 STATUS approved

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Last modified August 20 00:52 EDT 2018. Contains 313902 sequences. (Running on oeis4.)