21 December

The factors of 6 (excluding 6 itself) are 1, 2 and 3. \(1+2+3=6\), so 6 is a perfect number.
Today's number is the only three digit perfect number.


Show me a random puzzle
 Most recent collections 

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

List of all puzzles


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


Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2019