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Jim Howson
Articles by Jim Howson
Keep the coins in the matrix out of line with their opposites
None
Date:
08 September 2009
This the only possible layout, not counting reflections and rotations. Try more Puzzlers >>
Keep the coins in the matrix out of line with their opposites
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Date:
08 September 2009
For this week's problem I ask you to draw a 5x5 matrix of such a size that each of the 25 cells will accomodate either a 1p coin (here represented as a blue circle) or a 5p coin (red circle).
Place the digits in the fractions to sum them to unity
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Date:
01 September 2009
Back in August 2007 one of our columns was based on a quest to find two fractions, made up from the ten integers 1, 2, 3, 4, 5, 6, 7, 8, 9 and 0, which sum...
Place the digits in the fractions to sum them to unity
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Date:
01 September 2009
The unique solution is:
A trawl through the archive reveals a minimum trio of squares
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Date:
25 August 2009
Way back in December 2003, our column was based on the integers 80, 320 and 41. What makes this triad unusual is the fact that, if we designate them...
A trawl through the archive reveals a minimum trio of squares
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Date:
25 August 2009
The minimum Barnetson triad is: 17, 32 and 32, producing the respective squares of 49, 49 and 64. Paul, who died last year, was a well-known computer...
Separate the triplets by their value once more
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Date:
06 August 2009
On April 14 this year our Puzzler...
Separate the triplets by their value once more
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Date:
06 August 2009
81T1319638473T6495874625T29725 In order to render the solution unique, it was necessary to position the 10s at T at the outset. Otherwise there are...
Find the only way to complete the nine-digit line
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Date:
28 July 2009
Early research carried out in the 1800s, without the benefit of computers, showed there is only one way to plug the numbers 1 to 9 (no zero) into this expression...
Find the only way to complete the nine-digit line
None
Date:
28 July 2009
Early research carried out in the 1800s, without the benefit of computers, showed there is only one way to plug the numbers 1 to 9 (no zero) into this expression...
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