

A321216


Decimal expansion of C[12] coefficient in 1/N expansion of the lowest Laplacian Dirichlet eigenvalue of the Piarea, Nsided 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
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OFFSET

5,1


COMMENTS

This is the 12th coefficient C[12] in the 1/N expansion of the lowest Laplacian Dirichlet eigenvalue of Piarea, Nsided 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 unitradius 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 Nsided, Piarea 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 lowerorder coefficients (except C[11] [A321215]), e.g., C[3]=4*zeta(3) and C[5]=(122*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., 385149, 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 ultraprecise 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*L0/316*L0^2)*zeta(3)^4+(1360/3488*L0/3+456*L0^2+107*L0^3/3+5*L0^4/8)*zeta(3)*zeta(9)+(432216*L0207*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



