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?


Show me a random puzzle
 Most recent collections 

Advent calendar 2020

Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

List of all puzzles


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


Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2021