diff --git a/amicable.sage b/amicable.sage
index 917503c..050b616 100644
--- a/amicable.sage
+++ b/amicable.sage
@@ -16,7 +16,7 @@ DEFAULT_TWOADICITY = 32
 DEFAULT_STRETCH = 0
 
 COEFFICIENT_RANGE = (5,)
-#COEFFICIENT_RANGE = range(1, 10000)
+#COEFFICIENT_RANGE = range(1, 100)
 
 ACCEPTABLE_PRIMES = (5,)
 #ACCEPTABLE_PRIMES = Primes()
@@ -98,6 +98,9 @@ def symmetric_range(n, base=0, step=1):
 
 def find_nice_curves(strategy, L, twoadicity, stretch, wid, processes):
     for (p, T, V) in strategy(L, max(0, twoadicity-stretch), wid, processes):
+        if p % (1<<twoadicity) != 1:
+            continue
+
         sys.stdout.write('.')
         sys.stdout.flush()