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

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

Archive

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