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A010474 Decimal expansion of square root of 18. 11
4, 2, 4, 2, 6, 4, 0, 6, 8, 7, 1, 1, 9, 2, 8, 5, 1, 4, 6, 4, 0, 5, 0, 6, 6, 1, 7, 2, 6, 2, 9, 0, 9, 4, 2, 3, 5, 7, 0, 9, 0, 1, 5, 6, 2, 6, 1, 3, 0, 8, 4, 4, 2, 1, 9, 5, 3, 0, 0, 3, 9, 2, 1, 3, 9, 7, 2, 1, 9, 7, 4, 3, 5, 3, 8, 6, 3, 2, 1, 1, 1, 6, 5, 5, 1, 1, 6, 2, 6, 0, 2, 9, 8, 2, 9, 2, 4, 7, 1 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Continued fraction expansion is 4 followed by {4, 8} repeated. - Harry J. Smith, Jun 05 2009

3*2^(1/2) = sqrt(18) is also the minimum width of the arms of the cellular automaton described in A294020. - Omar E. Pol, Oct 29 2017

LINKS

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

EXAMPLE

4.242640687119285146405066172629094235709015626130844219530039213972197... - Harry J. Smith, Jun 03 2009

MATHEMATICA

RealDigits[N[Sqrt[18], 200]][[1]] (* Vladimir Joseph Stephan Orlovsky, Feb 21 2011 *)

PROG

(PARI) { default(realprecision, 20080); x=sqrt(18); for (n=1, 20000, d=floor(x); x=(x-d)*10; write("b010474.txt", n, " ", d)); } \\ Harry J. Smith, Jun 03 2009

CROSSREFS

Cf. A040013 Continued fraction. - Harry J. Smith, Jun 03 2009

Sequence in context: A300004 A147973 A278527 * A064887 A114424 A246819

Adjacent sequences:  A010471 A010472 A010473 * A010475 A010476 A010477

KEYWORD

nonn,cons

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified January 21 17:53 EST 2019. Contains 319349 sequences. (Running on oeis4.)