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 A020765 Decimal expansion of 1/sqrt(8). 10
 3, 5, 3, 5, 5, 3, 3, 9, 0, 5, 9, 3, 2, 7, 3, 7, 6, 2, 2, 0, 0, 4, 2, 2, 1, 8, 1, 0, 5, 2, 4, 2, 4, 5, 1, 9, 6, 4, 2, 4, 1, 7, 9, 6, 8, 8, 4, 4, 2, 3, 7, 0, 1, 8, 2, 9, 4, 1, 6, 9, 9, 3, 4, 4, 9, 7, 6, 8, 3, 1, 1, 9, 6, 1, 5, 5, 2, 6, 7, 5, 9, 7, 1, 2, 5, 9, 6, 8, 8, 3, 5, 8, 1, 9, 1, 0, 3, 9, 3 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Multiplied by 10, this is the real and the imaginary part of sqrt(25i). - Alonso del Arte, Jan 11 2013 Radius of the midsphere (tangent to the edges) in a regular tetrahedron with unit edges. - Stanislav Sykora, Nov 20 2013 The side of the largest cubical present that can be wrapped (with cutting) by a unit square of wrapping paper. See Problem 10716 link. - Michel Marcus, Jul 24 2018 LINKS Ivan Panchenko, Table of n, a(n) for n = 0..1000 Michael L. Catalano-Johnson, Daniel Loeb and John Beebee, A cubical gift: Problem 10716, The American Mathematical Monthly, Vol. 108, No. 1 (Jan., 2001), pp. 81-82. Wikipedia, Tetrahedron Wikipedia, Platonic solid FORMULA A010503 divided by 2. Equals A201488 minus 1/2. Equals 1/(A010487-4) minus 1/4. - Jon E. Schoenfield, Jan 09 2017 EXAMPLE 1/sqrt(8) = 0.353553390593273762200422181052424519642417968844237018294... MAPLE Digits:=100; evalf(1/sqrt(8)); # Wesley Ivan Hurt, Mar 27 2014 MATHEMATICA RealDigits[N[1/Sqrt[8], 200]] (* Vladimir Joseph Stephan Orlovsky, May 27 2010 *) PROG (PARI) sqrt(1/8) \\ Charles R Greathouse IV, Apr 25 2016 CROSSREFS Cf. Midsphere radii in Platonic solids: A020761 (octahedron), A010503 (cube), A019863 (icosahedron), A239798 (dodecahedron). Sequence in context: A096634 A105439 A142972 * A112756 A121795 A253027 Adjacent sequences:  A020762 A020763 A020764 * A020766 A020767 A020768 KEYWORD nonn,cons AUTHOR STATUS approved

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Last modified November 16 15:26 EST 2018. Contains 317274 sequences. (Running on oeis4.)