Please see number 1 in the series (Are you a square?) for a full description of the walk, there is street parking available in the village of Weald.
The cache is not at the posted coordinates.
This is a relatively simple puzzle, the information below will help you to solve it and might assist with a slightly harder one placed close by.
The number of small triangles in a larger triangular shape is given by N=4n3+10n2+4n-1+(-1)n/16 where n is the number of rows of small triangles within the large triangle. An alternative way of solving this problem is to used N=(n(n+2)(2n+1)-1)/8 when n is an odd number or N=n(n+2)(2n+1)/8 when n is an even number.
| Number of Rows |
Number of triangles |
| 1 |
1 |
| 2 |
5 |
| 3 |
13 |
| 4 |
27 |
| 5 |
48 |
| 6 |
78 |
| 7 |
118 |
If there are ab triangles in the figure above, the cache can be found at
N51 13.a(a-a)(a+a) E000 09.(a+a+b)(a+a+b)(a+b)
*** Congratulations to -KROP- on FTF ***