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 A062073 Decimal expansion of Fibonacci factorial constant. 32
 1, 2, 2, 6, 7, 4, 2, 0, 1, 0, 7, 2, 0, 3, 5, 3, 2, 4, 4, 4, 1, 7, 6, 3, 0, 2, 3, 0, 4, 5, 5, 3, 6, 1, 6, 5, 5, 8, 7, 1, 4, 0, 9, 6, 9, 0, 4, 4, 0, 2, 5, 0, 4, 1, 9, 6, 4, 3, 2, 9, 7, 3, 0, 1, 2, 1, 4, 0, 2, 2, 1, 3, 8, 3, 1, 5, 3, 1, 2, 1, 6, 8, 4, 5, 2, 6, 2, 1, 5, 6, 2, 4, 9, 4, 7, 9, 7, 7, 4, 1, 2, 5, 9, 1, 3 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The Fibonacci factorial constant is associated with the Fibonacci factorial A003266. Two closely related constants are A194159 and A194160. [Johannes W. Meijer, Aug 21 2011] REFERENCES S. R. Finch, Mathematical Constants, Cambridge, 2003, Section 1.2.5. R. L. Graham, D. E. Knuth and O. Patashnik, Concrete Mathematics, Addison Wesley, 1990, pp. 478, 571. LINKS Harry J. Smith, Table of n, a(n) for n=1..5000 M. Griffiths, Symmetric rational expressions in the Fibonacci numbers, Fib. Q., 46/47 (2008/2009), 262-267. [N. J. A. Sloane, Dec 05 2009] Simon Plouffe, Fibonacci factorials Eric Weisstein's World of Mathematics, Fibonacci Factorial Constant FORMULA C = (1-a)*(1-a^2)*(1-a^3)... 1.2267420... where a = -1/phi^2 and where phi is the Golden ratio = 1/2 + sqrt(5)/2. C = QPochhammer[ -1/GoldenRatio^2]. [Eric W. Weisstein, Dec 01 2009] C = A194159 * A194160. [Johannes W. Meijer, Aug 21 2011] C = exp( Sum_{k>=1} 1/(k*(1-(-(3+sqrt(5))/2)^k)) ). - Vaclav Kotesovec, Jun 08 2013 C = Sum_{k = -inf .. inf} (-1)^((k-1)*k/2) / phi^((3*k-1)*k), where phi = (1 + sqrt(5))/2. - Vladimir Reshetnikov, Sep 20 2016 EXAMPLE 1.226742010720353244417630230455361655871409690440250419643297301214... MATHEMATICA RealDigits[N[QPochhammer[-1/GoldenRatio^2], 105]][[1]] (* Alonso del Arte, Dec 20 2010 *) RealDigits[N[Re[(-1)^(1/24) * GoldenRatio^(1/12) / 2^(1/3) * EllipticThetaPrime[1, 0, -I/GoldenRatio]^(1/3)], 120]][[1]] (* Vaclav Kotesovec, Jul 19 2015, after Eric W. Weisstein *) PROG (PARI) \p 1300 a=-1/(1/2+sqrt(5)/2)^2; prod(n=1, 17000, (1-a^n)) (PARI) { default(realprecision, 5080); p=-1/(1/2 + sqrt(5)/2)^2; x=prodinf(k=1, 1-p^k); for (n=1, 5000, d=floor(x); x=(x-d)*10; write("b062073.txt", n, " ", d)) } \\ Harry J. Smith, Jul 31 2009 CROSSREFS Cf. A003266, A003267, A003268, A056569, A062072, A062381, A135407, A181926. Cf. A218490, A253924, A256831, A259314, A259405. Sequence in context: A174789 A210865 A210861 * A021445 A011145 A177852 Adjacent sequences: A062070 A062071 A062072 * A062074 A062075 A062076 KEYWORD easy,nonn,cons AUTHOR Jason Earls, Jun 27 2001 STATUS approved

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Last modified December 4 21:02 EST 2022. Contains 358570 sequences. (Running on oeis4.)