Advent calendar 2018

7 December

There is a row of 1000 closed lockers numbered from 1 to 1000 (inclusive). Near the lockers, there is a bucket containing the numbers 1 to 1000 (inclusive) written on scraps of paper.
1000 people then each do the following:
Today's number is the number of lockers that will be closed at the end of this process.

Show answer


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


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


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