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Puzzles

22 December

Today's number is a palindrome. Today's number is also the number of palindromes between 111 and 11111 (including 111 and 11111).

14 December

What is the only palindromic three digit prime number which is also palindromic when written in binary?

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Advent calendar 2020

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Sunday Afternoon Maths LXVII

Coloured weights
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