diff --git a/ChangeLog b/ChangeLog
index 424d644..e9d9ec8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2005-02-27  Richard B. Kreckel  <kreckel@ginac.de>
+	
+	* examples/perfnum.cc: update to presumed 42st Mersenne prime.
+
 2004-11-28  Richard B. Kreckel  <kreckel@ginac.de>
 
 	Disambiguate binary operators of CLN types with float/double
diff --git a/examples/perfnum.cc b/examples/perfnum.cc
index d8ba5a0..1b7c969 100644
--- a/examples/perfnum.cc
+++ b/examples/perfnum.cc
@@ -8,8 +8,8 @@ using namespace cln;
 
 int main ()
 {
-	// previous ones were 1257787, 1398269, 2976221, 3021377, 6972593, 13466917, 20996011
-	int p = 24036583;
+	// previous ones were 1257787, 1398269, 2976221, 3021377, 6972593, 13466917, 20996011, 24036583
+	int p = 25964951;
 	cl_I x = (((cl_I)1 << p) - 1) << (p-1);
 	cout << x << endl;
 }