5 December

Today's number is the number of ways that 35 can be written as the sum of distinct numbers, with none of the numbers in the sum being divisible by 9.
Clarification: By "numbers", I mean (strictly) positive integers. The sum of the same numbers in a different order is counted as the same sum: eg. 1+34 and 34+1 are not different sums. The trivial sum consisting of just the number 35 counts as a sum.


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


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


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