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Advent calendar 2017

4 December

Pick a three digit number whose digits are all different.
Sort the digits into ascending and descending order to form two new numbers. Find the difference between these numbers.
Repeat this process until the number stops changing. The final result is today's number.

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Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

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Cryptic crossnumber #2

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Cryptic crossnumber #1
Breaking Chocolate
Square and cube endings

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