a(0) = 21; for n > 0, a(n) is the smallest triangular number which is a (proper) multiple of a(n-1).
A068142
a(0) = 21; for n > 0, a(n) is the smallest triangular number which is a (proper) multiple of a(n-1).
Terms
- a(0) =21a(1) =105a(2) =210a(3) =630a(4) =25200a(5) =32004000a(6) =508031496000
External references
- oeis: A068142