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 A141848 Decimal expansion of the Pell constant. 3
 5, 8, 0, 5, 7, 7, 5, 5, 8, 2, 0, 4, 8, 9, 2, 4, 0, 2, 2, 9, 0, 0, 4, 3, 8, 9, 2, 2, 9, 7, 0, 2, 5, 7, 4, 7, 7, 6, 6, 0, 4, 6, 7, 6, 5, 6, 0, 7, 3, 3, 3, 2, 5, 0, 9, 1, 9, 5, 5, 0, 0, 8, 3, 3, 6, 8, 2, 2, 7, 9, 4, 9, 1, 2, 7, 2, 9, 0, 8, 0, 6, 0, 8, 9, 9, 7, 6, 7, 5, 4, 5, 2, 5, 7, 6, 1, 8, 0, 4, 4, 9, 7, 1, 4, 1 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 REFERENCES Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, p. 119. LINKS Wieb Bosma and Peter Stevenhagen, Density computations for real quadratic units, Mathematics of Computation, Vol. 65, No. 215 (1996), pp. 1327-1337. Peter Stevenhagen, The number of real quadratic fields having units of negative norm, Experimental Mathematics, Vol. 2, No. 2 (1993), pp. 121-136; alternative link. Peter Stevenhagen, A density conjecture for the negative Pell equation, in: W. Bosma, A. van der Poorten (eds.), Computational Algebra and Number Theory, Springer, Dordrecht, 1995, pp. 187-200. Eric Weisstein's World of Mathematics, Pell Constant. FORMULA Equals 1 - QPochhammer(1/2, 1/4). Equals 1 - Product_{n>=0} (1 - 1/2^(2*n+1)). - Jean-François Alcover, May 20 2014 Equals 1 - A132020. - Amiram Eldar, Apr 11 2022 EXAMPLE 0.58057755820489240229... MATHEMATICA RealDigits[1-QPochhammer[1/2, 1/4], 10, 120][[1]] (* Harvey P. Dale, Dec 17 2011 *) CROSSREFS Cf. A132020. Sequence in context: A198360 A153420 A193505 * A349398 A349397 A140249 Adjacent sequences: A141845 A141846 A141847 * A141849 A141850 A141851 KEYWORD nonn,cons AUTHOR Eric W. Weisstein, Jul 11 2008 STATUS approved

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Last modified April 1 09:50 EDT 2023. Contains 361688 sequences. (Running on oeis4.)