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A203811 Denominators of s(i) = s(i-1) - (1/i)*sign(s(i-1)) with s(1) = 1. 6
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 (list; graph; refs; listen; history; text; internal format)
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.

CROSSREFS

Cf. A002805, A203810 (numerators), A203812.

Sequence in context: A119862 A111936 A232090 * A002805 A231693 A232112

Adjacent sequences:  A203808 A203809 A203810 * A203812 A203813 A203814

KEYWORD

nonn,frac

AUTHOR

Hugo Pfoertner and Rainer Rosenthal, Jan 06 2012

STATUS

approved

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Last modified October 15 13:06 EDT 2019. Contains 328030 sequences. (Running on oeis4.)