Data commit

Task/Self-numbers/Python/self-numbers.py

@@ -0,0 +1,35 @@
+class DigitSumer :
+    def __init__(self):
+        sumdigit = lambda n : sum( map( int,str( n )))
+        self.t = [sumdigit( i ) for i in xrange( 10000 )]
+    def __call__ ( self,n ):
+        r = 0
+        while n >= 10000 :
+            n,q = divmod( n,10000 )
+            r += self.t[q]
+        return r + self.t[n]
+
+
+def self_numbers ():
+    d = DigitSumer()
+    s = set([])
+    i = 1
+    while 1 :
+        n = i + d( i )
+        if i in s :
+            s.discard( i )
+        else:
+            yield i
+        s.add( n )
+        i += 1
+
+import time
+p = 100
+t = time.time()
+for i,s in enumerate( self_numbers(),1 ):
+    if i <= 50 :
+        print s,
+        if i == 50 : print
+    if i == p :
+        print '%7.1f sec  %9dth = %d'%( time.time()-t,i,s )
+        p *= 10