data/problems/19.yml
---
:id: 19
:name: Counting Sundays
:url: https://projecteuler.net/problem=19
:content: "You are given the following information, but you may prefer to do some
research for yourself.\n\n- 1 Jan 1900 was a Monday.\n- Thirty days has September,
\ \nApril, June and November. \nAll the rest have thirty-one, \nSaving February
alone, \nWhich has twenty-eight, rain or shine. \nAnd on leap years, twenty-nine.\n-
A leap year occurs on any year evenly divisible by 4, but not on a century unless
it is divisible by 400.\n\nHow many Sundays fell on the first of the month during
the twentieth century (1 Jan 1901 to 31 Dec 2000)?\n\n"