# Advent calendar 2018

## Archive

Show me a random puzzle**Most recent collections**

#### Sunday Afternoon Maths LXVII

Coloured weightsNot Roman numerals

#### Advent calendar 2018

#### Sunday Afternoon Maths LXVI

Cryptic crossnumber #2#### Sunday Afternoon Maths LXV

Cryptic crossnumber #1Breaking Chocolate

Square and cube endings

List of all puzzles

## Tags

averages probability multiples fractions calculus means integration balancing addition 3d shapes squares shapes polygons division cryptic crossnumbers factors chalkdust crossnumber logic routes folding tube maps regular shapes cryptic clues algebra coins sum to infinity ave indices surds planes time square roots taxicab geometry clocks bases graphs differentiation spheres multiplication dice functions lines advent geometry sport factorials complex numbers irreducible numbers hexagons cube numbers triangles area grids probabilty crosswords doubling number circles angles menace proportion floors scales symmetry partitions sequences books square numbers ellipses people maths prime numbers rugby games parabolas digits integers chocolate wordplay cards 2d shapes trigonometry perimeter triangle numbers coordinates palindromes percentages crossnumbers volume sums arrows colouring unit fractions speed quadratics perfect numbers chess money remainders star numbers shape numbers odd numbers pascal's triangle rectangles mean christmas dates dodecagons## 10 December

The equation \(x^2+1512x+414720=0\) has two integer solutions.

Today's number is the number of (positive or negative) integers \(b\) such that \(x^2+bx+414720=0\) has two integer solutions.