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 A270404 Denominators of r-Egyptian fraction expansion for the Euler-Mascheroni constant (EulerGamma), where r(k) = 1/Fibonacci(k+1). 1
 2, 7, 58, 5005, 17866792, 376849528799811, 200293775046575062138461261536, 32943134937280084367481102479381536199595464025076702877604 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Suppose that r is a sequence of rational numbers r(k) <= 1 for k >= 1, and that x is an irrational number in (0,1).  Let f(0) = x, n(k) = floor(r(k)/f(k-1)), and f(k) = f(k-1) - r(k)/n(k).  Then x = r(1)/n(1) + r(2)/n(2) + r(3)/n(3) + ..., the r-Egyptian fraction for x. See A269993 for a guide to related sequences. LINKS Clark Kimberling, Table of n, a(n) for n = 1..11 Eric Weisstein's World of Mathematics, Egyptian Fraction EXAMPLE Euler-Mascheroni constant = 1/2 + 1/(2*7) + 1/(3*58) + ... MATHEMATICA r[k_] := 1/Fibonacci[k+1]; f[x_, 0] = x; z = 10; n[x_, k_] := n[x, k] = Ceiling[r[k]/f[x, k - 1]] f[x_, k_] := f[x, k] = f[x, k - 1] - r[k]/n[x, k] x = EulerGamma; Table[n[x, k], {k, 1, z}] PROG (PARI) r(k) = 1/fibonacci(k+1); f(k, x) = if (k==0, x, f(k-1, x) - r(k)/a(k, x); ); a(k, x=Euler) = ceil(r(k)/f(k-1, x)); \\ Michel Marcus, Apr 05 2016 CROSSREFS Cf. A269993, A000045, A001620. Sequence in context: A269994 A023364 A120952 * A270315 A083810 A215209 Adjacent sequences:  A270401 A270402 A270403 * A270405 A270406 A270407 KEYWORD nonn,frac,easy AUTHOR Clark Kimberling, Mar 30 2016 STATUS approved

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Last modified June 18 20:45 EDT 2021. Contains 345121 sequences. (Running on oeis4.)