A229099 Decimal expansion of 1 - 6/Pi^2.

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

Offset: 0

Author

Charles R Greathouse IV, Sep 13 2013

Keywords

• nonn
• cons
• easy

Comments

Probability that a random number is not squarefree; probability that two random numbers have a common divisor greater than 1.

Examples

			0.39207289814597337133672322074163416657384735196652070692634580863496...
		

Links

• Charles R Greathouse IV, Table of n, a(n) for n = 0..10000
• Index entries for transcendental numbers

Crossrefs

Cf. A000796, A002388, A013661, A059956, A063035.

Programs

Mathematica

RealDigits[1-1/Zeta[2],10,90][[1]] (* Stefano Spezia, Feb 21 2025 *)

PARI

1-6/Pi^2

Formula

Equals 1 - 1/zeta(2). - Stefano Spezia, Feb 21 2025