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 A109017 a(n) = Kronecker symbol (-6/n). 11
 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, -1, 0, 0, 0, -1, 0, -1, 0, 0, 0, -1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, -1, 0, 0, 0, -1, 0, -1, 0, 0, 0, -1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, -1, 0, 0, 0, -1, 0, -1, 0, 0, 0, -1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, -1, 0, 0, 0, -1, 0, -1, 0, 0, 0, -1, 0, 1, 0, 0, 0, 1, 0, 1, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 REFERENCES L. B. W. Jolley, Summation of Series, Dover Publications, 1961. LINKS G. C. Greubel, Table of n, a(n) for n = 0..10000 Eric Weisstein's World of Mathematics, Kronecker Symbol Index entries for linear recurrences with constant coefficients, signature (0,0,0,1,0,0,0,-1). FORMULA Euler transform of length-24 sequence [ 0, 0, 0, 1, 0, 1, 0, -1, 0, 0, 0, -2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1]. a(n) = -a(-n) = a(n+24) for all n in Z. G.f.: x * (1 + x^6) / (1 - x^4 + x^8). G.f.: x *(1 -x^8)*(1 -x^12)^2 /((1 -x^4)*(1 -x^6)*(1 -x^24)). Sum_{n>=1} |a(n)|/n^2 = Pi^2/9 [Jolley equ. 338]. EXAMPLE G.f. = x + x^5 + x^7 + x^11 - x^13 - x^17 - x^19 - x^23 + x^25 + x^29 + ... MAPLE A109017 := proc(n)         numtheory[jacobi](-6, n) ; end proc: # R. J. Mathar, Nov 03 2011 MATHEMATICA Table[KroneckerSymbol[-6, n], {n, 0, 104}] (* Jean-François Alcover, Jan 10 2014 *) PROG (PARI) {a(n) = kronecker(-6, n)}; (PARI) {a(n) = (n%2) * (n%3!=0) * (-1)^(n\12)}; (MAGMA) [KroneckerSymbol(-6, n): n in [0..120]]; // Vincenzo Librandi, Aug 09 2015 CROSSREFS Sequence in context: A285530 A317542 A322796 * A110161 A134667 A117943 Adjacent sequences:  A109014 A109015 A109016 * A109018 A109019 A109020 KEYWORD sign,mult,easy AUTHOR Michael Somos, Jun 16 2005 STATUS approved

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Last modified August 23 11:24 EDT 2019. Contains 326222 sequences. (Running on oeis4.)