Euler #80

It is well known that if the square root of a natural number is not an integer, then it is irrational.

from decimal import *
from math import sqrt

getcontext().prec = 105

reduce(int.__add__, 
       map(lambda a: \
           reduce(lambda x,y: int(x)+int(y), 
                  str(a.sqrt()).replace('.', '')[:100], 
                  0), 
           map(lambda n: Decimal(str(n)), 
               map(lambda k: \
                   0 if int(sqrt(k)) ** 2 == k else k, 
                   range(100))
              )
          ), 
       0)

Surely it's cheating ;)