All CW None

Take away the values to add the trilateral digits

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Author: Jim Howson
Date: 18 November 2008

Bob Lewis, from Abbey Wood in London, contributes this week's poser. This is a very simple three-deck difference triangle, made up from the consecutive...

Take away the values to add the trilateral digits

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Author: Jim Howson
Date: 18 November 2008

Bob Lewis will receive £20 for this contribution. Return to the homepage>> Try...

Make a constant of 21 to hex the conundrum

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Date: 11 November 2008

This diagram shows how it is possible to distribute the consecutive series 1-to-12 around a hexagon, one number to each node, in such a way that each straight...

Make a constant of 21 to hex the conundrum

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Author: Jim Howson
Date: 11 November 2008

Please post all Puzzler enquiries and contributions to: Jim Howson, 5 Hilltop Gardens, Dartford, Kent DA1 5JF Return...

Find the colour-values to deduce the third row

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Author: Jim Howson
Date: 29 October 2008

Try this neat little problem in your head - it's not as easy as it looks. Your task is to determine which total the third column sums to, by deducing...

Find the colour values to deduce the third row

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Author: Jim Howson
Date: 29 October 2008

The third column is in fact a red herring. It is not needed when finding the three colour-values. For example, examining the first two columns on the left,...

Unswop the pairs of numbers to bring back the magic

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Author: Jim Howson
Date: 21 October 2008

This diagram started life as a magic square containing the consecutive series 1 to 16. All four rows, columns and the two long diagonals each summed to a...

Find the permutable prime and two spoiling factors

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Author: Jim Howson
Date: 14 October 2008

In mathematical parlance, the prime number 113 is said to be permutable because it remains prime regardless of how the digits are arranged, that is 131 and...

Find the permutable prime and two spoiling factors

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Date: 14 October 2008

Our first problem is solved by 337, which permutes to produce the primes 373 and 733. Secondly, the two factors of 11,111,111,111 are 21,649 and 513,239.

Turn the numbers inside out to make a magic square

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Date: 01 October 2008

This diagram shows the four corner numbers of a 4x4 magic square. What makes the square remarkable is the fact that not only is a constant of 242 generated...

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All CW None

Take away the values to add the trilateral digits

Take away the values to add the trilateral digits

Make a constant of 21 to hex the conundrum

Make a constant of 21 to hex the conundrum

Find the colour-values to deduce the third row

Find the colour values to deduce the third row

Unswop the pairs of numbers to bring back the magic

Find the permutable prime and two spoiling factors

Find the permutable prime and two spoiling factors

Turn the numbers inside out to make a magic square

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