This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A215615 From Wendt's determinant compute sqrt(abs(A048954(n))/(2^n - 1)). 5
 1, 1, 2, 5, 11, 0, 232, 2295, 26714, 453871, 7053157, 0, 7715707299, 545539395584, 42297694603648, 4883188189089105, 531361846217471443, 0, 28649272821614715410221, 14214363393075742724609375, 7526219790642312236217153392, 5968603205606800870499639536231 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS E. Lehmer claimed, and J. S. Frame proved, that a(n) is an integer (Ribenboim 1999, p. 128). The subsequence for even n is A129205. See A048954 for additional comments, references, links, and cross-references. REFERENCES P. Ribenboim, Fermat's Last Theorem for Amateurs, Springer-Verlag, NY, 1999, pp. 126, 136. LINKS FORMULA a(n) = ((-1)^(n-1)*A048954(n)/(2^n - 1))^(1/2). MATHEMATICA w[n_] := Resultant[x^n - 1, (1 + x)^n - 1, x]; Table[ Sqrt[Abs[w[n]]/(2^n - 1)], {n, 25}] CROSSREFS Cf. A048954, A129205, A215616. Sequence in context: A133035 A133516 A163784 * A018862 A175310 A175311 Adjacent sequences:  A215612 A215613 A215614 * A215616 A215617 A215618 KEYWORD nonn AUTHOR Jonathan Sondow, Aug 17 2012 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 22 18:38 EDT 2018. Contains 316500 sequences. (Running on oeis4.)