A203811 - OEIS

A203811

Denominators of s(i) = s(i-1) - (1/i)*sign(s(i-1)) with s(1) = 1.

1, 2, 6, 12, 60, 20, 140, 280, 2520, 2520, 27720, 27720, 360360, 360360, 72072, 144144, 2450448, 2450448, 46558512, 232792560, 232792560, 232792560, 5354228880, 5354228880, 26771144400, 26771144400, 80313433200, 80313433200, 2329089562800, 2329089562800

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OFFSET

1,2

COMMENTS

Numerators are given in A203810. The first 14 terms coincide with those of A002805.

LINKS

Hugo Pfoertner, Table of n, a(n) for n = 1..200

EXAMPLE

See A203810.

MATHEMATICA

nxt[{n_, a_}]:={n+1, a-1/(n+1) Sign[a]}; NestList[nxt, {1, 1}, 30][[All, 2]]//Denominator (* Harvey P. Dale, Jun 06 2021 *)

CROSSREFS