A094098 Number of divisor chains of length n in which the first term is a divisor of n(n+1)/2 ("cyclic" divisor chains).

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

Offset: 1

Author

Christopher Landauer, May 04 2004

Keywords

• nonn
• more

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.

Crossrefs

Cf. A067957, A094097, A094099.

Extensions

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