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

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

Archive

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