diff --git a/extra/project-euler/001/001.factor b/extra/project-euler/001/001.factor
index 0d4f5fb1bd..e4c8a20cb3 100644
--- a/extra/project-euler/001/001.factor
+++ b/extra/project-euler/001/001.factor
@@ -1,4 +1,4 @@
-! Copyright (c) 2007, 2008 Aaron Schaefer, Slava Pestov.
+! Copyright (c) 2007-2009 Aaron Schaefer, Slava Pestov.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: kernel math math.functions math.ranges project-euler.common sequences
     sets ;
@@ -47,14 +47,14 @@ PRIVATE>
 
 
 : euler001b ( -- answer )
-    1000 [ [ 5 mod ] [ 3 mod ] bi [ 0 = ] either? ] filter sum ;
+    1000 iota [ [ 5 mod ] [ 3 mod ] bi [ 0 = ] either? ] filter sum ;
 
 ! [ euler001b ] 100 ave-time
 ! 0 ms ave run time - 0.06 SD (100 trials)
 
 
 : euler001c ( -- answer )
-    1000 [ { 3 5 } [ divisor? ] with any? ] filter sum ;
+    1000 iota [ { 3 5 } [ divisor? ] with any? ] filter sum ;
 
 ! [ euler001c ] 100 ave-time
 ! 0 ms ave run time - 0.06 SD (100 trials)
diff --git a/extra/project-euler/005/005.factor b/extra/project-euler/005/005.factor
index 7fef29a6b9..8512bc97fa 100644
--- a/extra/project-euler/005/005.factor
+++ b/extra/project-euler/005/005.factor
@@ -1,6 +1,6 @@
-! Copyright (c) 2007 Aaron Schaefer.
+! Copyright (c) 2007, 2009 Aaron Schaefer.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: math math.functions sequences project-euler.common ;
+USING: math math.functions math.ranges project-euler.common sequences ;
 IN: project-euler.005
 
 ! http://projecteuler.net/index.php?section=problems&id=5
@@ -18,7 +18,7 @@ IN: project-euler.005
 ! --------
 
 : euler005 ( -- answer )
-    20 1 [ 1+ lcm ] reduce ;
+    20 [1,b] 1 [ lcm ] reduce ;
 
 ! [ euler005 ] 100 ave-time
 ! 0 ms ave run time - 0.14 SD (100 trials)
diff --git a/extra/project-euler/030/030.factor b/extra/project-euler/030/030.factor
index 54d48660d5..7c8334cfd4 100644
--- a/extra/project-euler/030/030.factor
+++ b/extra/project-euler/030/030.factor
@@ -38,7 +38,7 @@ IN: project-euler.030
 PRIVATE>
 
 : euler030 ( -- answer )
-    325537 [ dup sum-fifth-powers = ] filter sum 1- ;
+    325537 iota [ dup sum-fifth-powers = ] filter sum 1- ;
 
 ! [ euler030 ] 100 ave-time
 ! 1700 ms ave run time - 64.84 SD (100 trials)
diff --git a/extra/project-euler/048/048.factor b/extra/project-euler/048/048.factor
index e56b9e9548..640a3a68f6 100644
--- a/extra/project-euler/048/048.factor
+++ b/extra/project-euler/048/048.factor
@@ -1,6 +1,6 @@
 ! Copyright (c) 2008 Aaron Schaefer.
 ! See http://factorcode.org/license.txt for BSD license.
-USING: kernel math math.functions sequences project-euler.common ;
+USING: kernel math math.functions math.ranges project-euler.common sequences ;
 IN: project-euler.048
 
 ! http://projecteuler.net/index.php?section=problems&id=48
@@ -17,7 +17,7 @@ IN: project-euler.048
 ! --------
 
 : euler048 ( -- answer )
-    1000 [ 1+ dup ^ ] sigma 10 10 ^ mod ;
+    1000 [1,b] [ dup ^ ] sigma 10 10 ^ mod ;
 
 ! [ euler048 ] 100 ave-time
 ! 276 ms run / 1 ms GC ave time - 100 trials
diff --git a/extra/project-euler/055/055.factor b/extra/project-euler/055/055.factor
index 43f380b3ba..6154e29717 100644
--- a/extra/project-euler/055/055.factor
+++ b/extra/project-euler/055/055.factor
@@ -61,7 +61,7 @@ IN: project-euler.055
 PRIVATE>
 
 : euler055 ( -- answer )
-    10000 [ lychrel? ] count ;
+    10000 iota [ lychrel? ] count ;
 
 ! [ euler055 ] 100 ave-time
 ! 478 ms ave run time - 30.63 SD (100 trials)
diff --git a/extra/project-euler/057/057.factor b/extra/project-euler/057/057.factor
index 681a17dd9e..0c434f4506 100644
--- a/extra/project-euler/057/057.factor
+++ b/extra/project-euler/057/057.factor
@@ -11,14 +11,14 @@ IN: project-euler.057
 ! It is possible to show that the square root of two can be expressed
 ! as an infinite continued fraction.
 
-! √ 2 = 1 + 1/(2 + 1/(2 + 1/(2 + ... ))) = 1.414213...
+!     √ 2 = 1 + 1/(2 + 1/(2 + 1/(2 + ... ))) = 1.414213...
 
 ! By expanding this for the first four iterations, we get:
 
-! 1 + 1/2 = 3/2 = 1.5
-! 1 + 1/(2 + 1/2) = 7/5 = 1.4
-! 1 + 1/(2 + 1/(2 + 1/2)) = 17/12 = 1.41666...
-! 1 + 1/(2 + 1/(2 + 1/(2 + 1/2))) = 41/29 = 1.41379...
+!     1 + 1/2 = 3/2 = 1.5
+!     1 + 1/(2 + 1/2) = 7/5 = 1.4
+!     1 + 1/(2 + 1/(2 + 1/2)) = 17/12 = 1.41666...
+!     1 + 1/(2 + 1/(2 + 1/(2 + 1/2))) = 41/29 = 1.41379...
 
 ! The next three expansions are 99/70, 239/169, and 577/408, but the
 ! eighth expansion, 1393/985, is the first example where the number of
@@ -35,9 +35,9 @@ IN: project-euler.057
     >fraction [ number>string length ] bi@ > ; inline
 
 : euler057 ( -- answer )
-    0 1000 [ drop 2 + recip dup 1+ longer-numerator? ] count nip ;
+    0 1000 iota [ drop 2 + recip dup 1+ longer-numerator? ] count nip ;
 
-! [ euler057 ] time
-! 3.375118 seconds
+! [ euler057 ] 100 ave-time
+! 1728 ms ave run time - 80.81 SD (100 trials)
 
 SOLUTION: euler057