About a maths question

1. Will there be absolutely result of this formula?
1/1+1/2+1/3+1/4+1/5+1/6+1/7......1/(undefined)
2. Any simple formula to calculate this formula
1/1+1/2+1/3+1/4+1/5+1/6+1/7......1/n
e.g. (1+2+3+4+...+n)^2=1^3+2^3+3^3+......n^3