May be you will find something to help in the book above
I want you to consider the number below.
21200
It has a rare characteristic that it shares with only a handful of others. I want you to find the number that shares these characteristics and that starts with a 6. When you have the number, make a Weary Banker string with it. ( If you need a reminder how to do this you will find full instructions in our cache GC52QJH 'A Man of Axmouth')
The cache can be found at
North 50 4 J.(B-D)(G+I)(J-L)
West 002 5 O. (N-G)(M+H)(E+F)
The customary prize awaits FTF
You can validate your puzzle solution with certitude.