mscroggs.co.uk
mscroggs.co.uk

subscribe

Advent calendar 2015

23 December

This number is a prime number. If you treble it and add 16, the result is also prime. Repeating this will give 11 prime numbers in total (including the number itself).

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

List of all puzzles

Tags

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

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2020