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


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


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