Ponder This Challenge - September 2005 - Acceleration rate of pulley systemPuzzleDon Coppersmith01 Sep 2005Ponder This
Ponder This Challenge - August 2005 - first N digits of M is divisible by NPuzzleDon Coppersmith01 Aug 2005Ponder This
Ponder This Challenge - July 2005 - Covering table with coinsPuzzleDon Coppersmith01 Jul 2005Ponder This
Ponder This Challenge - June 2005 - Almost balanced A/B stringsPuzzleDon Coppersmith01 Jun 2005Ponder This
Ponder This Challenge - May 2005 - Rectangular grid / glass cubesPuzzleDon Coppersmith01 May 2005Ponder This
Ponder This Challenge - April 2005 - Divisibility of integer powersPuzzleDon Coppersmith01 Apr 2005Ponder This
Ponder This Challenge - March 2005 - 6x6x6 cube with different signaturesPuzzleDon Coppersmith01 Mar 2005Ponder This
Ponder This Challenge - February 2005 - Infinite right trianglesPuzzleDon Coppersmith01 Feb 2005Ponder This
Ponder This Challenge - January 2005 - 7-colored 35 beads necklacePuzzleDon Coppersmith01 Jan 2005Ponder This
Ponder This Challenge - December 2004 - Projecting points onto the complex planePuzzleDon Coppersmith01 Dec 2004Ponder This
Ponder This Challenge - November 2004 - Sum of numbers after worm ate somePuzzleDon Coppersmith01 Nov 2004Ponder This
Ponder This Challenge - October 2004 - GCD of values of primitive polynomialPuzzleDon Coppersmith01 Oct 2004Ponder This
Ponder This Challenge - September 2004 - Another versions of turntablePuzzleDon Coppersmith01 Sep 2004Ponder This
Ponder This Challenge - August 2004 - Longest way to come homePuzzleDon Coppersmith01 Aug 2004Ponder This
Ponder This Challenge - June 2004 - Rectangles in the unit squarePuzzleDon Coppersmith01 Jun 2004Ponder This