mscroggs.co.uk
mscroggs.co.uk

subscribe

Advent calendar 2020

20 December

18 can be written as the sum of 3 consecutive (strictly) positive integers: 5 + 6 + 7.
18 can also be written as the sum of 4 consecutive (strictly) positive integers: 3 + 4 + 5 + 6.
18 is in fact the smallest number that can be written as the sum of both 3 and 4 consecutive (strictly) positive integers.
Today's number is the smallest number that can be written as the sum of both 12 and 13 consecutive (strictly) positive integers.

Show answer

Tags: numbers, sums

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2020

Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018


List of all puzzles

Tags

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

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2021