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 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

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elections perimeter star numbers floors sums planes volume algebra 2d shapes the only crossnumber multiplication taxicab geometry graphs addition means crossnumber unit fractions circles ellipses cryptic clues functions dates clocks spheres parabolas square numbers probabilty scales cards sum to infinity money division grids mean calculus time squares surds proportion dodecagons complex numbers integration coordinates ave irreducible numbers perfect numbers routes digits logic colouring multiples prime numbers digital clocks differentiation percentages number odd numbers cube numbers hexagons square roots dominos crosswords sport advent range integers dice products partitions angles 3d shapes remainders menace polygons median pascal's triangle lines folding tube maps chalkdust crossnumber rectangles fractions averages bases books tiling coins triangles games shapes gerrymandering probability cryptic crossnumbers sequences regular shapes symmetry doubling factorials trigonometry chess rugby palindromes christmas wordplay people maths speed crossnumbers shape triangle numbers numbers quadratics chocolate area factors indices balancing arrows geometry


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