mscroggs.co.uk
mscroggs.co.uk

subscribe

Advent calendar 2015

14 December

What is the only palindromic three digit prime number which is also palindromic when written in binary?

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

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

Archive

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