Web Reference: How many Sundays fell on the first of the month during the twentieth century (1 Jan 1901 to 31 Dec 2000)? Problem 19: Counting Sundays You are given the following information, but you may prefer to do some research for yourself. 1 Jan 1900 was a Monday. Thirty days has September, April, June and November. All the rest have thirty-one, Saving February alone, Which has twenty-eight, rain or shine. And on leap years, twenty-nine. Python solution for Project Euler Problem 19 (Counting Sundays). Calculate the number of Sundays falling on the first of the month in the 20th century.
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