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 2024

Advent calendar 2023

Advent calendar 2022

Advent calendar 2021
List of all puzzles

Tags

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

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2025