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Advent calendar 2018

9 December

Today's number is the number of numbers between 10 and 1,000 that contain no 0, 1, 2 or 3.

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Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

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