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 A086783 Discriminant of the polynomial x^n - 1. 2
 1, 4, -27, -256, 3125, 46656, -823543, -16777216, 387420489, 10000000000, -285311670611, -8916100448256, 302875106592253, 11112006825558016, -437893890380859375, -18446744073709551616, 827240261886336764177, 39346408075296537575424, -1978419655660313589123979 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Mohammad K. Azarian, On the Hyperfactorial Function, Hypertriangular Function, and the Discriminants of Certain Polynomials, International Journal of Pure and Applied Mathematics, Vol. 36, No. 2, 2007, pp. 249-255.  Mathematical Reviews, MR2312537.  Zentralblatt MATH, Zbl 1133.11012. FORMULA a(n) = (-1)^[(n-1)/2] * n^n = (-1)^[(n-1)/2] * A000312(n). PROG (Sage) def A086783(n) : return (-1)^((n-1)//2) * n^n # Eric M. Schmidt, May 04 2013 (PARI) a(n)=poldisc('x^n-1); \\ Joerg Arndt, May 04 2013 CROSSREFS Cf. A000312, A004124. Sequence in context: A245414 A000312 A177885 * A301742 A050764 A302108 Adjacent sequences:  A086780 A086781 A086782 * A086784 A086785 A086786 KEYWORD sign,easy AUTHOR Yuval Dekel (dekelyuval(AT)hotmail.com), Aug 03 2003 EXTENSIONS More terms from Eric M. Schmidt, May 04 2013 STATUS approved

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Last modified October 21 10:33 EDT 2018. Contains 316414 sequences. (Running on oeis4.)