a(n) is the smallest triangular number (A000217) that can be represented as a product of k triangular numbers greater than 1 for all k = 1,2,...,n. a(n)=-1 if no such triangular number exists.
A296098
a(n) is the smallest triangular number (A000217) that can be represented as a product of k triangular numbers greater than 1 for all k = 1,2,...,n. a(n)=-1 if no such triangular number exists.
Terms
- a(0) =3a(1) =36a(2) =630a(3) =25200a(4) =25200a(5) =2821500
External references
- oeis: A296098