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


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


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