mscroggs.co.uk
mscroggs.co.uk

subscribe

Advent calendar 2016

14 December

In July, I posted the Combining Multiples puzzle.
Today's number is the largest number that cannot be written in the form \(27a+17b\), where \(a\) and \(b\) are positive integers (or 0).

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

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

Archive

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