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


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


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