A140249 Decimal expansion of 3*sqrt(15)/2.

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

Offset

1,1

Comments

Exradius opposite the side of length 4 of the obtuse scalene triangle with sides of lengths 2, 3 and 4, the scalene triangle with least integer side lengths. See formulas in the Weisstein link.

Links

Daniel Starodubtsev, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Exradius.

Index entries for algebraic numbers, degree 2

Formula

3*sqrt(15)/2 = 3*A010472/2 = 2*A140239 = 3*A088543 = 5*A140248.

Example

5.80947501931112532776889809967359941624938255793738623988136064917022463790...

Mathematica

First[RealDigits[3 Sqrt[15]/2, 10, 100]] (* Paolo Xausa, Oct 30 2023 *)

Prog

(PARI) 3*sqrt(15)/2

Crossrefs

Cf. A140239, A140240, A140241, A140242, A140243, A140244, A140245, A140246, A140247, A140248, A088543, A010472.

Sequence in context: A141848 A349398 A349397 * A335928 A081564 A199073

Adjacent sequences: A140246 A140247 A140248 * A140250 A140251 A140252

Keyword

cons,nonn

Author

Rick L. Shepherd, May 14 2008

Status

approved