A269995 Denominators of r-Egyptian fraction expansion for sqrt(2) - 1, where r = (1,1/2,1/3,1/4,...)

3, 7, 36, 1300, 2206054, 14887222782418, 292542996759533035472424790, 7282957087563143077864043818232331102110274520711753058, 259880230781524461939787525796521055875618560291171401151227648777033604862236784108033156713828890456025177451

Offset: 1

Author

Clark Kimberling, Mar 15 2016

Keywords

• nonn
• frac
• easy

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.

Examples

			sqrt(2) - 1 = 1/(2*3) + 1/(3*7) + 1/(4*36) + ...
		

Links

• Clark Kimberling, Table of n, a(n) for n = 1..12
• Eric Weisstein's World of Mathematics, Egyptian Fraction
• Index entries for sequences related to Egyptian fractions

Crossrefs

Cf. A269993.

Programs

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 = Sqrt[2] - 1; Table[n[x, k], {k, 1, z}]