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

A094098

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

Terms

    a(0) =1a(1) =0a(2) =2a(3) =0a(4) =2a(5) =0a(6) =3a(7) =0a(8) =5a(9) =0a(10) =6a(11) =0a(12) =6a(13) =0a(14) =147a(15) =1a(16) =22a(17) =2a(18) =27a(19) =165a(20) =519a(21) =0a(22) =516a(23) =2021a(24) =1912a(25) =506a(26) =45658a(27) =514a(28) =7308a(29) =1535

External references