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 A321216 Decimal expansion of C[12] coefficient in 1/N expansion of the lowest Laplacian Dirichlet eigenvalue of the Pi-area, N-sided regular polygon. 2
 2, 5, 2, 0, 0, 9, 7, 3, 7, 9, 2, 9, 3, 2, 4, 6, 4, 6, 7, 6, 0, 6, 5, 2, 1, 2, 2, 3, 9, 5, 3, 8, 5, 4, 7, 7, 0, 2, 8, 7, 8, 0, 6, 5, 3, 2, 2, 5, 5, 6, 6, 1, 4, 6, 4, 9, 7, 9, 0, 1, 5, 3, 9, 4, 4, 7, 7, 3, 6, 0, 5, 4, 2, 4, 0, 2, 9, 8, 2, 8, 3, 6, 7, 4, 5, 6, 6, 2, 0, 7, 3, 7, 1, 3, 4, 1, 5, 7, 8, 5 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 5,1 COMMENTS This is the 12th coefficient C[12] in the 1/N expansion of the lowest Laplacian Dirichlet eigenvalue of Pi-area, N-sided regular polygon. It was determined using experimental mathematics by computing the coefficient to 125 digits of precision. It can be computed using the expression in the Formula section. It is expressed in terms of L0 = [A115368]^2 = [A244355] = 5.78318... (eigenvalue of unit-radius circle) and Riemann zeta functions. Although this is derived using experimental mathematics, the decimal expansion reported is equal to that expression. In context, the eigenvalue expression for the N-sided, Pi-area regular polygon is L = L0*(1 + C[3]/N^3 + C[5]/N^5 + C[6]/N^6 + C[7]/N^7 + C[8]/N^8 + ... + C[12]/N^12 + ...). The expression for this coefficient follows a pattern similar to lower-order coefficients (except C[11] [A321215]), e.g., C[3]=4*zeta(3) and C[5]=(12-2*L0)*zeta(5). LINKS Robert Stephen Jones, Table of n, a(n) for n = 5..1004 Mark Boady, Applications of Symbolic Computation to the Calculus of Moving Surfaces. PhD thesis, Drexel University, Philadelphia, PA. 2015. P. Grinfeld and G. Strang, Laplace eigenvalues on regular polygons: A series in 1/N, J. Math. Anal. Appl., 385-149, 2012. Robert Stephen Jones, The fundamental Laplacian eigenvalue of the regular polygon with Dirichlet boundary conditions, arXiv:1712.06082 [math.NA], 2017. Robert Stephen Jones, Computing ultra-precise eigenvalues of the Laplacian within polygons, Advances in Computational Mathematics, May 2017. EXAMPLE 25200.9737929324646760652122395385477028780653225566146497901539447736054240... PROG (PARI) {default(realprecision, 100); L0=solve(x=2, 3, besselj(0, x))^2; (32/3+272*L0/3-16*L0^2)*zeta(3)^4+(1360/3-488*L0/3+456*L0^2+107*L0^3/3+5*L0^4/8)*zeta(3)*zeta(9)+(432-216*L0-207*L0^2+47*L0^3/2+11*L0^4/8)*zeta(5)*zeta(7)} CROSSREFS Cf. A321215 is decimal expansion of C[11], the next lower order coefficient. Cf. A115368, A244355, A002117, and A013663. Sequence in context: A190950 A159985 A259667 * A193083 A146103 A245172 Adjacent sequences:  A321213 A321214 A321215 * A321217 A321218 A321219 KEYWORD nonn,cons AUTHOR Robert Stephen Jones, Oct 31 2018 STATUS approved

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Last modified February 20 22:51 EST 2019. Contains 320362 sequences. (Running on oeis4.)