Make a constant of 21 to hex the conundrum

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

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

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This was last published in November 2008

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