Moved solutions till 35 to Python.

python/lib_prime.py

@@ -1,3 +1,4 @@
+from functools import lru_cache
 try:
     from lib_misc import get_item_counts
     from lib_misc import product
@@ -43,6 +44,7 @@ def prime_factors_count(n):
     return get_item_counts(prime_factors(n))
 
 
+@lru_cache(maxsize=10000)
 def is_prime(n):
     """Returns True if n is prime and False otherwise.