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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Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

Sunday Afternoon Maths LXV

Cryptic crossnumber #1
Breaking Chocolate
Square and cube endings

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


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