A232715 Decimal expansion of the ratio of the area of a parbelos to the area of its associated arbelos: 4/(3*Pi).

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

Offset: 0

Author

Jonathan Sondow, Nov 28 2013

Keywords

• nonn
• cons
• easy

Comments

Also distance from the diameter of unit semicircle to its centroid. - Franck Maminirina Ramaharo, Oct 22 2018

Examples

			0.424413181578387562050356702326704965425225721974550529993779...
		

Links

• J. Sondow, The parbelos, a parabolic analog of the arbelos, arXiv 2012, Amer. Math. Monthly 120 (2013) 929-935.
• E. Tsukerman, Solution of Sondow's problem: a synthetic proof of the tangency property of the parbelos, arXiv 2012.
• Index entries for transcendental numbers

Crossrefs

Reciprocal of A177870. Ratio of lengths of boundaries is A232716.

Programs

Mathematica

RealDigits[4/(3 Pi),10,100]

PARI

4/Pi/3 \\ Charles R Greathouse IV, Oct 01 2022