A010507 - OEIS

A010507

Decimal expansion of square root of 54.

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

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OFFSET

1,1

COMMENTS

Continued fraction expansion is 7 followed by {2, 1, 6, 1, 2, 14} repeated. - Harry J. Smith, Jun 06 2009

Surface area to volume ratio of an octahedron with unit side length. - Wesley Ivan Hurt, May 02 2021

LINKS

Harry J. Smith, Table of n, a(n) for n = 1..20000

Wikipedia, Surface-area-to-volume ratio

Index entries for algebraic numbers, degree 2.

EXAMPLE

7.348469228349534294591852224117674175897842441970010385298077701752881...

MATHEMATICA

RealDigits[N[Sqrt[54], 200]][[1]] (* Vladimir Joseph Stephan Orlovsky, Feb 24 2011 *)

PROG

(PARI) { default(realprecision, 20080); x=sqrt(54); for (n=1, 20000, d=floor(x); x=(x-d)*10; write("b010507.txt", n, " ", d)); } \\ Harry J. Smith, Jun 06 2009

CROSSREFS

Cf. A010140 (continued fraction).

Sequence in context: A011252 A165331 A225442 * A030710 A117037 A011476

Adjacent sequences: A010504 A010505 A010506 * A010508 A010509 A010510

KEYWORD

nonn,cons

AUTHOR

N. J. A. Sloane

STATUS

approved