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A094098 Number of divisor chains of length n in which the first term is a divisor of n(n+1)/2 ("cyclic" divisor chains). 2
1, 0, 2, 0, 2, 0, 3, 0, 5, 0, 6, 0, 6, 0, 147, 1, 22, 2, 27, 165, 519, 0, 516, 2021, 1912, 506, 45658, 514, 7308, 1535, 30746, 68918, 145920, 1370 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

A divisor chain of length n is an arrangement of 1..n such that each term is a divisor of the sum of the preceding terms.

LINKS

Table of n, a(n) for n=1..34.

CROSSREFS

Cf. A067957, A094097, A094099.

Sequence in context: A005868 A035455 A029191 * A182485 A164960 A124137

Adjacent sequences:  A094095 A094096 A094097 * A094099 A094100 A094101

KEYWORD

nonn

AUTHOR

Chris Landauer (cal(AT)aero.org), May 04, 2004.

EXTENSIONS

a(29)-a(34) from John W. Layman, May 07 2004

STATUS

approved

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Last modified April 20 06:02 EDT 2014. Contains 240779 sequences.