Update 2015 solutions

2015/d20.py

@@ -4,6 +4,7 @@ import lib
 data = int(open(0).read().strip())
 part_1 = False
 
+
 def calc(n):
     fs = lib.prime_factors(n)
     vs = set([1, n])
@@ -21,6 +22,7 @@ def calc(n):
             r += e * 11
     return r
 
+
 for i in range(3, 10000000):
     c = calc(i)
     if c >= data: