Numbers n such that exactly two positive d in the range d <= n/2 exist which divide binomial(n-d-1, d-1) and which are not coprime to n.
A178098
Numbers n such that exactly two positive d in the range d <= n/2 exist which divide binomial(n-d-1, d-1) and which are not coprime to n.
Terms
- a(0) =26a(1) =30a(2) =36a(3) =40a(4) =42a(5) =44a(6) =91a(7) =95a(8) =115a(9) =119a(10) =133a(11) =161a(12) =187a(13) =247a(14) =391a(15) =667a(16) =1147a(17) =1591a(18) =1927a(19) =2491a(20) =3127a(21) =4087a(22) =4891a(23) =5767a(24) =7387a(25) =9991a(26) =10807a(27) =11227a(28) =12091a(29) =17947
External references
- oeis: A178098