The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation. Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A269997 Denominators of r-Egyptian fraction expansion for -1 + golden ratio, where r = (1,1/2,1/3,1/4,...) 2
 2, 5, 19, 511, 224138, 60658204540, 203857858414658884506671, 65699957103246706854223474912465037343245580906, 3942313430901049708832516976840058495554562175116278047675351101544028510870033057494673090034 (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..12 Eric Weisstein's World of Mathematics, Egyptian Fraction EXAMPLE tau - 1 = 1/2 + 1/(2*5) + 1/(3*19) + ... MATHEMATICA r[k_] := 1/k; 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 = GoldenRatio - 1; Table[n[x, k], {k, 1, z}] CROSSREFS Cf. A269993. Sequence in context: A119550 A119563 A270398 * A270547 A177875 A187602 Adjacent sequences:  A269994 A269995 A269996 * A269998 A269999 A270000 KEYWORD nonn,frac,easy AUTHOR Clark Kimberling, Mar 15 2016 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 19 06:37 EST 2020. Contains 331033 sequences. (Running on oeis4.)