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diff --git a/kbruch/src/primenumber.h b/kbruch/src/primenumber.h
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+/***************************************************************************
+                          primenumber.h  -  class primenumber
+                             -------------------
+    begin                : Tue Nov 27 16:40:42 CET 2001
+    copyright            : (C) 2001 by Sebastian Stein
+    email                : seb.kde@hpfsc.de
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef PRIMZAHL_H
+#define PRIMZAHL_H
+
+#include <qvaluevector.h>
+
+typedef QValueVector<uint> UnsignedIntArray;
+
+/** Class to handle prime numbers.
+ *  The prime numbers are stored in a static vector, so that different instances
+ *  can use them. Each time a higher prime number is needed, the new found prime
+ *  number is stored in the vector. To check if a given number is a prime number
+ *  this vector is scanned and if needed new prime numbers are generated. This
+ *  algorithm should reduce calculation time and speed up every program using
+ *  this prime number class.
+ *  \author Sebastian Stein */
+class primenumber
+{
+public:
+	/** constructor */
+	primenumber();
+
+	/** destructor */
+	~primenumber();
+
+	/** returns wether the given number is a prime number */
+	short isPrimeNumber(uint number);
+
+	/** returns the next prime number */
+	unsigned int get_next();
+
+	/** returns the first prime number */
+	unsigned int get_first() const;
+
+	/** return the last known prime number */
+	unsigned int get_last() const;
+
+	/** returns the current prime number */
+	unsigned int get_current() const;
+
+	/** moves the internal pointer to the first prime number */
+	void move_first();
+
+	/** moves the internal pointer to the last prime number */
+	void move_last();
+
+	/** moves the internal pointer to the next prime number */
+	void move_forward();
+
+	/** moves the internal pointer to the previous prime number */
+	void move_back();
+
+	/** Displays all known prime numbers, mainly used for debugging. */
+	void display_all();
+private:
+	/** a vector storing all known prime numbers, access for all objects;
+	 * we are using the vector<T> template; so we do not have to think
+	 * about dynamic mem manipulation */
+	static UnsignedIntArray prim_vector;
+
+	/** current selected prime number */
+	UnsignedIntArray::iterator current_pos;
+
+	/** finds next prime number and adds it to the vector */
+	void find_next();
+};
+#endif