# Advent calendar 2020

## 20 December

18 can be written as the sum of 3 consecutive (strictly) positive integers: 5 + 6 + 7.

18 can also be written as the sum of 4 consecutive (strictly) positive integers: 3 + 4 + 5 + 6.

18 is in fact the smallest number that can be written as the sum of both 3 and 4 consecutive (strictly) positive integers.

Today's number is the smallest number that can be written as the sum of both 12 and 13 consecutive (strictly) positive integers.