26541

We have solved the Alisons Triangle problem with an algebraic formulae,
We solved it by working out the first few co-ordinates and turned them into an algebraic formulae.The first co-ordinate starts with an even number, two.You keep adding four to the X axis and the Y axis goes in a pattern of Ten Zero Ten Zero Etc.
When you reach the twenty-third term, you have done the question, but we have gone one step further. The answer 4n-2 will give you the algebraic formulae for the vertex of the triangle.
The answer for the vertex at the top of triangle 23 is therefore (90,10.)