Java Summation Program
Follow Java naming conventions.  Your package name should be all
lowercase - 'testspace'. 'reverselist' should be 'reverseList'.
Don't use fully qualified 'java.lang.Math', just 'Math'. You don't need to import classes from the java.lang package.
Indent your comments to match the code.
Use descriptive variable names, e.g. 'v' could be 'exponent' or
'power'.  Why use 'i' and then describe it as 'x' in the comment? Should 'reverselist' be 'reverseArray'?

In general your algorithms are reasonable.