A120011 Decimal expansion of sqrt(3)/4.

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

Offset: 0

Author

Eric Desbiaux, Jul 04 2008

Keywords

• nonn
• cons
• easy

Comments

Area of equilateral triangle of side 1.

Quadratic number with denominator 4 and minimal polynomial 16x^2 - 3. - Charles R Greathouse IV, Jun 30 2021

With offset 1, surface area of a pentagonal bipyramid (Johnson solid J_13) with unit edges. - Paolo Xausa, Aug 04 2025

Examples

			0.43301270189221932338186158537646809173570131345259515701395....
		

Links

• G. C. Greubel, Table of n, a(n) for n = 0..10000
• Wikipedia, Pentagonal bipyramid.
• Index entries for algebraic numbers, degree 2

Crossrefs

Cf. A010527.

Cf. Areas of higher regular polygons: A102771, A104956, A178817, A090488, A256853, A178816, A256854, A178809.

Programs

Mathematica

RealDigits[Sqrt[3]/4,10,120][[1]] (* Harvey P. Dale, Feb 18 2016 *)

PARI

sqrt(3)/4 \\ Charles R Greathouse IV, Jun 26 2013