From b47befab3696c40c710ee80f366fa376ec967b30 Mon Sep 17 00:00:00 2001
From: Joe Zhao <ztuowen@gmail.com>
Date: Wed, 1 Apr 2015 17:41:53 +0800
Subject: +40 +41

---
 H31.hs | 5 +++++
 H40.hs | 7 +++++++
 H41.hs | 9 +++++++++
 3 files changed, 21 insertions(+)
 create mode 100644 H41.hs

diff --git a/H31.hs b/H31.hs
index 9c321ca..7c0c8a6 100644
--- a/H31.hs
+++ b/H31.hs
@@ -1,3 +1,8 @@
+module H31
+(    isPrime
+,    isPrimeT
+) where
+
 import System.Random
 
 isPrime :: Integral a => a -> Bool
diff --git a/H40.hs b/H40.hs
index 448d372..4a31727 100644
--- a/H40.hs
+++ b/H40.hs
@@ -1,4 +1,9 @@
+module H40
+(   goldbach
+) where
+
 import H35
+import H31
 
 goldbach :: Integer -> (Integer, Integer)
 goldbach x = sepToSum x primes $ reverse $ takeWhile (<x) primes
@@ -7,3 +12,5 @@ goldbach x = sepToSum x primes $ reverse $ takeWhile (<x) primes
             | h+t > n = sepToSum n hhs ts
             | h+t < n = sepToSum n hs tts
             | otherwise = (h,t)
+
+goldbach' n = head [(x,y) | x <- (takeWhile (<n) primes),let y = n - x, isPrimeT y]
diff --git a/H41.hs b/H41.hs
new file mode 100644
index 0000000..1e9148b
--- /dev/null
+++ b/H41.hs
@@ -0,0 +1,9 @@
+import H40
+
+goldbachList :: Integer -> Integer -> [(Integer,Integer)]
+
+goldbachList a b 
+    | a `mod` 2 == 0 = map goldbach [a,(a+2)..b]
+    | otherwise = goldbachList (a+1) b
+
+goldbachList' a b = filter ((>50).fst) $ goldbachList a b
-- 
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