Update 1.7
+ fixed some issues in the English
translation
+ updated libraries
+ optimized some code
Update 1.6.7
+ sum of all divisors of an
integer
Update 1.6.6
+ added Catalan number
+ increased limit of cardinality (with
the use of BigInteger)
+ fixed InApp purchases (because of
changes in my merchant center they were broken for a few
days)