If you like stories and English language then this cache will lead you to one of the best places in UB.
FINDING IT MIGHT BE EASY, BUT OPENING THE CACHE IS ANOTHER STORY !!!
You need to enter, look around and maybe ask a worker about it.Might probably need to energize yourself with a coffee while you will try to find the code that is opening the cache. Is not going to be a easy job. Location is accessible Monday to Saturday between 9AM - 8PM (except Tsagaan Sar & Nadaam holidays).
Use your math knowledge to find the missing number:
73 79 83 89
127 131 137 139
179 181 191 193
233 239 241 ???