mscroggs.co.uk
mscroggs.co.uk
blog     puzzles     academic     talks     contact     subscribe↓ ☰ ↓

subscribe

Puzzles

Ten digit number

Source: Richard Wiseman's Blog
Can you create a 10-digit number, where the first digit is how many zeros in the number, the second digit is how many 1s in the number etc. until the tenth digit which is how many 9s in the number?

Show answer & extension

Tags: numbers
If you enjoyed this puzzle, check out Sunday Afternoon Maths XXIII,
puzzles about numbers, or a random puzzle.

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2025

Advent calendar 2024

Advent calendar 2023

Advent calendar 2022
List of all puzzles

Tags

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

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2026