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


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


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