Draw nested radicals
Python 3.5, 145 137 bytes

def s(n,x):[([print(' '*j+'\\'+'  '*i+'/ '+' '*j,end='')for j in range(x-i-1,-1,-1)],print('  '*i+i*'_____'or n))for i in range(x,-1,-1)]


Slightly ungolfed:

def s(n,x):
    for i in range(x,-1,-1):
        for j in range(x-i-1,-1,-1):
            print(' '*j+'\\'+'  '*i+'/ '+' '*j,end='')
        print('  '*i+i*'_____' or n)


Output:

s(2,4)
        ____________________
\      /       _______________
 \    /  \    /     __________
  \  /    \  /  \  /   _____
   \/      \/    \/  \/ 2