A140248 Decimal expansion of 0.3 * sqrt(15).

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

Offset

1,3

Comments

Exradius opposite the side of length 2 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.

Multiplied by 10, this is sqrt(135). - Alonso del Arte, Jan 06 2013

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

0.3*sqrt(15) = 0.3*A010472 = 0.4*A140239 = 0.6*A088543 = 0.2*A140249.

Example

1.16189500386222506555377961993471988324987651158747724797627212983404492758...

Mathematica

RealDigits[(3/10)Sqrt[15], 10, 105][[1]] (* Alonso del Arte, Jan 06 2013 *)

Prog

(PARI) 0.3*sqrt(15)

Crossrefs

Cf. A140239, A140240, A140241, A140242, A140243, A140244, A140245, A140246, A140247, A140249, A088543, A010472.

Sequence in context: A145314 A011490 A011395 * A336696 A127169 A202351

Adjacent sequences: A140245 A140246 A140247 * A140249 A140250 A140251

Keyword

cons,nonn

Author

Rick L. Shepherd, May 14 2008

Status

approved