A088246 Decimal expansion of 21/(2*Pi^2).

1, 0, 6, 3, 8, 7, 2, 4, 2, 8, 2, 4, 4, 5, 4, 6, 6, 0, 0, 1, 6, 0, 7, 3, 4, 3, 6, 3, 7, 0, 2, 1, 4, 0, 2, 0, 8, 4, 9, 5, 7, 6, 7, 1, 3, 4, 0, 5, 8, 5, 8, 8, 7, 6, 2, 8, 7, 8, 8, 9, 4, 8, 3, 4, 8, 8, 8, 8, 1, 7, 7, 7, 0, 1, 0, 3, 4, 7, 2, 1, 3, 2, 5, 0, 7, 6, 9, 7, 3, 7, 6, 2, 1, 9, 0, 2, 9, 2, 9, 4, 9, 4

Offset

1,3

Links

Table of n, a(n) for n=1..102.

Eric Weisstein's World of Mathematics, Moebius Function.

Index entries for transcendental numbers.

Formula

Equals Sum_{k>=1} 1/A030229(k)^2. - Amiram Eldar, May 23 2020

Equals zeta(4)/zeta(6). - Terry D. Grant, Nov 07 2020

Equals Sum_{k>=1} A007434(k)/k^6. - Amiram Eldar, Jan 25 2024

Example

1.06387242824454660016073436370214020849576713405858...

Mathematica

RealDigits[21/2/Pi^2, 10, 100][[1]] (* Amiram Eldar, May 23 2020 *)

Prog

(PARI) 21/2/Pi^2 \\ Charles R Greathouse IV, Oct 01 2022

Crossrefs

Cf. A007434, A030229, A082020, A088245.

Cf. A104141.

Sequence in context: A193080 A197135 A365522 * A179559 A086648 A268893

Adjacent sequences: A088243 A088244 A088245 * A088247 A088248 A088249

Keyword

nonn,cons

Author

Eric W. Weisstein, Sep 25 2003

Status

approved