A094098 - OEIS

A094098

Number of divisor chains of length n in which the first term is a divisor of n(n+1)/2 ("cyclic" divisor chains).

%I #6 Oct 11 2020 22:32:48

%S 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,

%T 506,45658,514,7308,1535,30746,68918,145920,1370

%N Number of divisor chains of length n in which the first term is a divisor of n(n+1)/2 ("cyclic" divisor chains).

%C 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.

%Y Cf. A067957, A094097, A094099.

%K nonn,more

%O 1,3

%A _Christopher Landauer_, May 04 2004

%E a(29)-a(34) from _John W. Layman_, May 07 2004