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A010592
Decimal expansion of cube root of 20.
1
2, 7, 1, 4, 4, 1, 7, 6, 1, 6, 5, 9, 4, 9, 0, 6, 5, 7, 1, 5, 1, 8, 0, 8, 9, 4, 6, 9, 6, 7, 9, 4, 8, 9, 2, 0, 4, 8, 0, 5, 1, 0, 7, 7, 6, 9, 4, 8, 9, 0, 9, 6, 9, 5, 7, 2, 8, 4, 3, 6, 5, 4, 4, 2, 8, 0, 3, 3, 0, 8, 5, 5, 6, 3, 2, 8, 7, 6, 5, 8, 4, 9, 4, 8, 7, 1, 9, 7, 3, 7, 6, 8, 5, 1, 5, 0, 1, 0, 4
OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..5000 (a(5000) corrected by Sean A. Irvine)
FORMULA
Equals sqrt(2*sqrt(5*sqrt(2*sqrt(5*sqrt(2*sqrt(5)...))))). - Zak Seidov, Dec 19 2009
EXAMPLE
2.71441761659490657151808946967948920480510776948909695728436544280330855632876...
MATHEMATICA
RealDigits[N[20^(1/3), 200]][[1]] (* Vladimir Joseph Stephan Orlovsky, Feb 06 2012 *)
RealDigits[CubeRoot[20], 10, 120][[1]] (* Harvey P. Dale, Dec 27 2023 *)
PROG
(PARI) sqrtn(20, 3) \\ Charles R Greathouse IV, Apr 14 2014
CROSSREFS
Cf. A010250 (continued fraction).
Sequence in context: A344930 A218792 A065254 * A096381 A346252 A346253
KEYWORD
nonn,cons
STATUS
approved