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


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


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