In mathematics, a **polygonal number** is a number represented as
dots or pebbles arranged in the shape of a regular polygon.
The dots are thought of as alphas (units).
These are one type of 2-dimensional figurate numbers.
The following picture shows how triangular numbers, square numbers,
pentagonal numbers and hexagonal numbers represented
as dots arranged in the shape of corresponding regular polygon.

2016 is not only a leap year but also a triangular and hexagonal year. If you are patient enough, you can count the number of the dots in the left triangle or in the right hexagon in the following picture. The number of dots in each shape is 2016.

Therefore, 2016 is a **triangular-hexagonal-leap** year.
The previous triangular-hexagonal-leap year is 1540 and the next is 2556.
So living to see 2016 is very rare experience.

You task is to list the triangular-hexagonal-leap years from 2016 to 990528. 990528 is also a triangular-hexagonal-leap year.

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